The list of standard abbreviations for JDS is available at adsa.org/jds-abbreviations-24. Nonstandard abbreviations are available in the Notes.
The aim of this study was to compare the effects of ...feeding homozygous β-CN A1 or A2 milk on the body composition, milk intake, and growth of German Holstein (GH), German Simmental (GS), and crossbred (CR) dairy calves of both sexes during the first 2 wk of life. A total of 104 calves (n = 54 female, f; and n = 50 male, m) from the breed groups GH (n = 23), GS (n = 61), and crossbred GH × GS (n = 20) were evaluated. Calves were weighed after birth and received colostrum ad libitum. On the second day, calves were alternately housed in pairs in double-igloo systems according to their random birth order and received either A1 milk (n = 52; 27 female and 25 male) or A2 milk (n = 52; 27 female and 25 male). They were offered 7.5 L/d, and the individual actual total milk intake was recorded. Daily energy-corrected milk intake was also calculated based on the milk composition (fat and protein). Fecal scores were recorded daily. On d 15, visceral adipose tissue (VAT) volume was assessed by open magnetic resonance imaging and dual-energy X-ray absorptiometry (DXA). In addition, fat and lean mass (g), as well as bone mineral content (g) and bone mineral density (g/cm2), were determined by DXA. The body composition, milk intake, and growth were similar between the 2 types of milk in the first 2 wk of life. Female calves had more VAT and fat mass, but less lean mass than male calves. GH and CR calves had more VAT and less lean mass than GS calves. Male calves were heavier than female calves after birth and on d 15. The average days with diarrhea and diarrhea occurrence were similar between calves fed A1 and A2 milk and between both sex groups. GS calves presented slightly more days with diarrhea and increased odds of having diarrhea compared with GH calves, not differing from CR.
•Different scenarios for dam-calf contact and amount of milk uptake were defined.•These systems have fewer kg saleable product to bear the environmental impacts.•Therefore, carbon footprints per kg ...of saleable milk and meat increase by 5–9%.•Economic allocation seems most suitable for assessing the impact per kg product.•Broader sustainability analysis including animal welfare and the economic is needed.
Systematic separation of cow and calf early after calving is common practice in both organic and conventional dairy farming. The main objective of this paper was to develop different scenarios for dam-calf contact and quantify their effects on milk uptake by the calf and environmental sustainability of the produced milk and meat from these systems.
Scenarios were set up of organic dairy systems to analyse the effect of different dam-calf systems with either half-time or full-time contact between cow and calf for 28, 51 or 91 days. Based on experience from practice and literature, we assumed a total milk uptake of 1,110 kg ECM milk with part-time contact and 1,207 kg ECM milk with full-time contact over 91 days. These scenarios were compared to traditional calf rearing systems with direct separation after birth and milk feeding from a bucket with low or high milk feeding levels of 460 and 630 kg ECM, respectively, in the first 91 days. The scenarios were analysed at a milk production level of 9,000 kg ECM per cow per year and with a sensitivity analysis covering yield levels of 7,000, 11,000 and 13,000 kg ECM per cow per year. At a production level of 9,000 kg ECM per year and full-time dam-calf contact throughout the milk period, only 85% of the milk produced could be delivered to the dairy company, compared to 93% when a low-level of milk is fed from a bucket. This means that there were fewer kg products to bear the environmental impacts, and hence the carbon footprint and land use from production per kg of ECM milk and meat sold was increased by between 5 and 9%, while the corresponding increase in impact at the highest yield level of 13,000 kg ECM was only between 4 and 6%. Besides environmental sustainability of cow-calf contact systems, the broader context of such systems need to be analysed including animal welfare and the economic effect for the farmer.
The mining-metallurgical industry in the central Andes of Peru is a source of lead (Pb) and cadmium (Cd) contamination in milk, and there are no studies on the impact of their ingestion. Using flame ...atomic absorption spectrometry, we quantified the concentration of these metals in raw milk produced in agroecological zones near these industries, and estimated the exposure and dietary risk in people aged 2–85 yr with minimum, average and maximum daily milk intake. In 2018, 40 raw milk samples were collected from 20 cows at two times of the year. The mean Pb and Cd concentrations were 577 ± 18.2 and 18.35 ± 5.4 μg/kg, all samples exceeded the maximum limits (ML). Children aged 2–5 and 6–15 yr, with average milk consumption, had Pb weekly intakes (WI) of 2019 and 2423 μg, exceeding the risk value; values for Cd 64 and 77 μg were below the risk values. In those older than 20 years the WI for both metals are below the risk values. The Dietary Risk Coefficient (DRC) to Pb in children younger than 8 years was >3 due to higher milk consumption in relation to body weight; for children aged 9–19 years it was 1.7 and 2.9, being <1 for those older than 20 yr. Cd RDCs were <1 at all ages, with the exception of 2-year-olds in the high milk consumption scenario (RDC > 1). There was notable evidence of Pb and Cd exposure risk from consumption of milk produced near mining-metallurgical activities, predominantly for children under 19-year-olds. In Peru there are no regulations for Pb and Cd in fresh milk and milk products, we recommended that ML for heavy metals in food be established.
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•Metallurgical industry is the main heavy metal contamination in the central Andes.•Pb and Cd milk concentration produced in this area exceeds the maximum limits.•This milk is unsuitable for consumption by children between the ages of 2–20 yr.•In Peru there are no regulations on heavy metals in milk.•The heavy metals content of milk produced in Peru should be regulated.
Biological signaling and communication between mothers and infants during breastfeeding may shape infant behavior and feeding. This signaling is complex and little explored in humans, although it is ...potentially relevant for initiatives to improve breastfeeding rates.
The aim of this study was to investigate physiological and psychological aspects of mother–infant signaling during breastfeeding experimentally, testing the effects of a relaxation intervention on maternal psychological state, breast milk intake, milk cortisol levels, and infant behavior and growth.
Primiparous breastfeeding mothers and full-term infants were randomly assigned to receive relaxation therapy intervention relaxation group; n = 33 (RG) or to the control group n = 31 (CG); no relaxation therapy at 2 wk postpartum. Both groups received standard breastfeeding support. Home visits were conducted at 2 (HV1), 6 (HV2), 12 (HV3) and 14 (HV4) wk to measure maternal stress and anxiety, breast milk intake and milk cortisol, and infant behavior and growth.
RG mothers had lower stress scores postintervention than the CG (HV3 ∆ = −3.13; 95% CI: −5.9, −0.3) and lower hindmilk cortisol at HV1 (∆ = −44.5%; 95% CI: −76.1%, −12.9%) but not at HV2. RG infants had longer sleep duration (∆ = 82 min/d; 95% CI: 16, 149 min/d) at HV2 and higher gains in weight and body mass index standardized deviation score than the CG infants (∆ = 0.76; 95% CI: 0.3, 1.22; and ∆ = 0.59; 95% CI: 0.09, 1.1, respectively). RG infants had a mean milk intake at HV3 that was 227 g/d higher than that of the CG infants (P = 0.031) after controlling for gender and milk intake at HV1.
The trial shows the effectiveness of a simple relaxation intervention for improving maternal and infant outcomes and identifies some potential signaling mechanisms for investigation in future and larger studies, especially in settings where mothers are more stressed, such as those with preterm or low birth weight infants. This trial was registered at clinicaltrials.gov as NCT01971216.
Maternal stress is one modifiable variable that could influence mother-infant signaling and negatively affect breastfeeding and infant growth.
This study aimed to test the hypothesis that relaxation ...therapy would reduce maternal stress and improve infant growth, behavior, and breastfeeding outcomes after late preterm (LP) and early-term (ET) delivery.
A single-blind randomized controlled trial was conducted in healthy Chinese primiparous mother-infant pairs after LP or ET delivery (34
-37
gestation weeks). Mothers were randomly assigned to the intervention group (IG, listening to relaxation meditation at least once a day) or control group (CG, normal care). Primary outcomes-changes in maternal stress (perceived stress scale), anxiety (Beck Anxiety Inventory), and infant weight and length standard deviation score-were assessed at 1 wk and 8 wks postpartum. Secondary outcomes-breast milk energy and macronutrient composition, maternal breastfeeding attitudes, infant behaviors (3-d diary), and 24-hour milk intake-were assessed at 8 wks.
In total, 96 mother-infant pairs were recruited. There was a significantly greater reduction in maternal perceived stress (Perceived Stress Scale score) (mean difference MD = 2.65; 95% CI: 0.8, 4.5) and significantly greater infant weight standard deviation score gain (MD = 0.51; 95% CI: 0.2, 0.9) from 1 wk to 8 wks in the IG than those in the CG. Exploratory analyses showed a significant interaction between intervention and sex, with greater effects on weight gain in female infants. Mothers of female infants used the intervention more frequently with significantly higher milk energy observed at 8 wks.
The relaxation meditation tape is a simple, effective practical tool that could easily be used in clinical settings to support breastfeeding mothers after LP and ET delivery. The findings need confirmation in larger groups and in other populations.
Breast milk is the sole source of nutrition for exclusively breastfed infants in the first 6 mo of life, yet few studies have measured micronutrient concentrations in breast milk in light of maternal ...diet and subsequent infant micronutrient intakes.
We evaluated the adequacy of micronutrient intakes of exclusively breastfed Indonesian infants by measuring milk volume and micronutrient concentrations and assessed maternal micronutrient intakes and their relationship with milk concentrations.
Mother–infant (2–5.3 mo) dyads (n = 113) were recruited for this cross-sectional study. Volume of breast-milk intake via the deuterium dose-to-mother technique over 14 d and analyzed micronutrient concentrations were used to calculate micronutrient intakes of exclusively breastfed infants. Maternal 3-d weighed food records were collected to assess median (IQR) micronutrient intakes. Multivariate regression analyses examined the association of usual maternal micronutrient intakes with milk micronutrient concentrations after adjustment for confounding variables.
Mean ± SD intake of breast-milk volume was 787 ± 148 mL/d. Median daily infant intakes of iron, zinc, selenium, magnesium, sodium, and B-vitamins (thiamin, riboflavin, niacin, pantothenic acid, B-6, and B-12) were below their respective Adequate Intakes. Inadequacies in maternal intakes (as % < estimated average requirements) were >40% for calcium, niacin, and vitamins A, B-6, and B-12. Significant positive associations existed between maternal usual intakes of vitamin A, niacin and riboflavin and milk retinol, nicotinamide, and free riboflavin concentrations in both unadjusted and adjusted (for infant age, milk volume, and parity) analyses (all P < 0.05).
The majority of micronutrient intakes for these exclusively breastfed infants and their mothers fell below recommendations, with associations between maternal intakes and breast-milk concentrations for 3 nutrients. Data on nutrient requirements of exclusively breastfed infants are limited, and a better understanding of the influence of maternal nutritional status on milk nutrient concentrations and its impact on the breastfed infant is needed.
•We studied inter-litter variation in rabbit pup activity, including its drivers.•Using an automatized method, we confirmed a U-shaped activity pattern along the day.•Locomotor activity was highest ...in litters with heavy pups with high milk intake.•We suggest that energetic constraints shape locomotor activity in 2–3-day-old pups.•Results may have implications for individual differences in activity within litters.
Individual-level sibling interactions in the litter huddle have been studied extensively, especially in the domestic rabbit (Oryctolagus cuniculus). However, little is known about inter-litter differences in pup activity patterns during early postnatal life, in particular regarding the drivers of such variation. In our study on 2–3-day-old rabbit pups, we predicted lower locomotor activity in litters with lower mean body masses on the day of birth (starting body mass) and with lower daily milk intake per pup, possibly constituting a behavioral strategy of pups to cope with associated energetic constraints. For an automatized assessment of pup locomotor activity in the litter huddle, we successfully developed and validated a method based on the quantification of dissimilarities between consecutive frames of video footage. Using this method, we could confirm a U-shaped time course of litter-level locomotor activity, with maximum values shortly before and after the once-daily nursing typical for the rabbit. As predicted, between-litter variation in mean starting body mass and in daily milk intake affected the degree of locomotor activity in the litter huddle, in an interactive way. That is, in litters with heavier starting body masses, pup locomotor activity was greater in pups with an initially higher milk intake, suggesting that only pups with better body condition and a higher energy intake could afford higher levels of activity. This interaction was exclusively apparent during the middle phase of the 24 h inter-nursing interval, when litter activity was low. Shortly before nursing, when pups show higher levels of locomotor behavior in anticipation of the mother's arrival, and shortly after nursing when the pups were more active possibly due to adjustments of their positions in the huddle, activity levels were decoupled from pups’ starting body mass and previous milk intake. Our findings highlight the importance of pup body mass and daily energy intake, two parameters known to be related to maternal characteristics, in shaping inter-litter differences in pup locomotor activity.
Abstract Background There are currently no national standards for school lunch period length and little is known about the association between the amount of time students have to eat and school food ...selection and consumption. Objective Our aim was to examine plate-waste measurements from students in the control arm of the Modifying Eating and Lifestyles at School study (2011 to 2012 school year) to determine the association between amount of time to eat and school meal selection and consumption. Design We used a prospective study design using up to six repeated measures among students during the school year. Participants/setting One thousand and one students in grades 3 to 8 attending six participating elementary and middle schools in an urban, low-income school district where lunch period lengths varied from 20 to 30 minutes were included. Main outcome measures School food selection and consumption were collected using plate-waste methodology. Statistical analyses performed Logistic regression and mixed-model analysis of variance was used to examine food selection and consumption. Results Compared with meal-component selection when students had at least 25 minutes to eat, students were significantly less likely to select a fruit (44% vs 57%; P <0.0001) when they had <20 minutes to eat. There were no significant differences in entrée, milk, or vegetable selections. Among those who selected a meal component, students with <20 minutes to eat consumed 13% less of their entrée ( P <0.0001), 10% less of their milk ( P <0.0001), and 12% less of their vegetable ( P <0.0001) compared with students who had at least 25 minutes to eat. Conclusions During the school year, a substantial number of students had insufficient time to eat, which was associated with significantly decreased entrée, milk, and vegetable consumption compared with students who had more time to eat. School policies that encourage lunches with at least 25 minutes of seated time might reduce food waste and improve dietary intake.
Human milk provides essential nutrition for infants, and its benefits are well established. We lack data on the influence of maternal nutritional status on milk volume and composition in low-middle ...income countries.
We aimed to 1) assess lactation performance (human milk volume, macronutrient composition, and infant energy intake) in Indian females and 2) examine the associations between maternal anthropometry (BMI, percentage body fat) and lactation performance.
We conducted an observational study among 232 mother-infant dyads, 2 to 4 mo postpartum in Haryana, India. We used deuterium oxide dose-to-mother technique to measure milk volume and maternal percentage body fat and collected human milk samples to determine macronutrient and energy concentrations. Adjusted multiple linear regression models were used to examine the associations between maternal anthropometry and lactation performance.
The mean BMI and percentage body fat of mothers were 21.7 ± 3.6 kg/m2 and 29.5 ± 7.7, respectively. Milk volume and macronutrient composition were similar to the reference values (means ± standard deviations: milk volume, 724 ± 184 mL/d; median (25th, 75th percentile); protein, 9.9 (8.3, 11.7) g/L; fat, 41.0 ± 15.2 g/L; energy density, 0.71 ± 0.14 kcal/g; lactose, 65.5 (55.3, 71.3) g/L). Maternal BMI and percentage body fat were not significantly associated with macronutrient composition. Both maternal BMI and percentage body fat were negatively associated with milk volume (-7.0, 95% CI: -12.4, -1.6 mL/d; -3.5, 95% CI: -6.0, -1.1mL/d, respectively) but there were no effects on the total energy intake of infants after adjusting for covariates.
Most mothers had a normal BMI and milk of similar composition and volume to reference values. Future work in populations with a greater burden of underweight and/or obesity are needed to examine the underlying mechanisms between maternal body composition and milk volume.
This trial was registered at The Clinical Trials Registry- India as CTRI/2017/01/007636.
The findings on the relationship between breastfeeding and children's motor development are very poor, particularly in low and middle income countries, because of the use of inadequate measures of ...breastfeeding practices.
To assess the relationship between exclusive breastfeeding, measured by the deuterium-oxide turnover method (DTM), and the acquisition of motor development in a cohort of Senegalese children.
One hundred forty mother-infant (4-5 mo) pairs were recruited and monitored up to 18 mo. Breast milk intake and breastfeeding practices were measured by DTM. Six stages of motor development were assessed: "sitting without support," "hands-and-knees crawling," "standing with assistance," "walking with assistance," "standing alone," and "walking alone." Acquisition age of motor milestones between exclusively breastfed (EBF) and not exclusively breastfed (non-EBF) infants was compared using Student's and Wilcoxon's tests. Mixed linear regression, adjusted with confounding factors, was used to determine the association between EBF and motor development.
Overall, 32.9% of infants were EBF at the enrollment at 4-5 mo of age. Breast milk intake of EBF infants was significantly higher than that of non-EBF infants (1039 ± 193 g/d compared with 915 ± 211 g/d; P < 0.01). At 4-5 mo of age, only "sitting without support" (67.4% compared with 47.9%, P = 0.02) and "hands-and-knees crawling" (17.4% compared with 4.3%, P = 0.01) were completed significantly in the EBF group. At 18 mo, all children had completed all 6 motor developmental milestones. However, their acquisition age was significantly earlier in the EBF group after adjustment. Non-EBF infants had a delay of 0.4 to 0.5 mo on the acquisition of the first 5 stages compared to EBF infants. For "walking alone," no difference was found after adjustment.
Motor skill acquisition is earlier in EBF infants compared to non-EBF infants. This finding highlights the need to strengthen the advocacy for EBF up to 6 mo.
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