In this experiment we have studied the bioproductives effects of energy-protein ratio at diferents levels of crude protein and metabolizabel energy, concerining whith broiler pulets and capons.The ...experiments was carried out on 80 fowls divided in four experimental groups ; (L1.1, L1.2, L1.3, and L1.3).In this experiment 40 subiects was capons and 40 was pullets.The used hybrid was Ross 308 because of his good versatility and productivity. The experiment was carried out in two phases of feeding program. First feeding stage was for gowing and begun at 54 days and was finished at 110 days. Second feeding stage was for finishing and begun at 111 days and finished at 130 days. At 84 days, we are proceeding for assessment slaughtering; therefore, we choose randomly 5 capons and 5 pullets for each groups. After slaughtering was made cutting by anatomical parts. Finaly was also carried out at slaughtering and cutting by anatomical parts.For all period we weighing all fowls and calculated feed conversion and mortality.
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IZUM, KILJ, NUK, PILJ, PNG, SAZU, UL, UM, UPUK
The research aimed to evaluate the influence exerted by the removal of the testicles (orchidectomy) in roosters on the fatty acids profile. In this regard, two batches of roosters belonging to the ...Transylvanian Naked Neck breed were formed; one batch was experimental (Lexp), composed of 20 birds castrated at the age of 7 weeks, and one batch was control (Lm), composed of 10 uncastrated roosters. The birds of the two groups were raised under identical conditions and received the same type of compound feed; their slaughter was performed at the age of 20 weeks. The results obtained after reporting the values of saturated fatty acids to unsaturated fatty acids recorded the highest value of 0.47 in the case of the muscles from the upper thighs of roosters (Lm). Regarding the ratio between polyunsaturated fatty acids and monounsaturated fatty acids, the highest value of 1.12 was calculated for the muscles of the upper thighs from capons (Lexp). Regarding the Ω3/Ω6 ratio, the highest value of 17.81 was calculated for the muscles of the upper thighs from the capons, while at the opposite pole was the result for the pectoral muscles of roosters from Lm, with the value of 12.48. We recommend continuing research in this direction.
The effects of caponization on growth performance, carcass characteristics, meat quality and fatty acid profile of breast and drumstick of Mos and Sasso genotypes, reared in free-range production ...system were examined. A total of 47 birds of Mos breed (19 Castrated and 25 Entire) and 37 of Sasso X-44 (18 Castrated and 19 Entire) slaughtered at 32 weeks were used in this trial. The growth of broilers and the differences between genotypes and caponization effects were modelled by Weibull-growth equation. Capon’s growth was higher than that obtained by roosters and Sasso weight was greater than Mos results (P<0.05). For both genotypes the chemical composition of breast and drumstick cuts showed significantly higher values of intramuscular fat (P<0.0001) and lesser values of moisture (P<0.0001) in capons in comparison with intact ones. In Mos breed, capons exhibited significantly (P<0.0001) higher values of breast and drumstick luminosity and yellowness, as well as lower values of redness. Regarding Warner-Braztler test (WB), there were no significant differences (P>0.05) by caponization effect, but hardness measured using textural profile analysis was lesser in meat from capons. Finally castration of animals led to important modifications in the intramuscular fat because meat from capons showed significantly lower values for total saturated fatty acids (SFA) and higher polyunsaturated fatty acids (PUFA ). Nutritional indices were also more favorable in capon’s meat, so overall fatty acid profile of capons was desirable from the viewpoint of human nutrition.
The aim of the study was to assess the influence of sex, including caponization, on selected physiological and productive traits of Greenleg partridge (GP) birds. The study material consisted of 120 ...GP chicks (40 females and 80 males), divided into 3 equal groups (4 replication in each) and kept in litter system and fed a
. A total of 40 cocks have been surgically castrated. The body weight (BW) of birds were measured biweekly. At the age of 24 weeks 8 birds/group were slaughtered, their carcasses were subjected to simplified dissection. Blood samples were collected and among others biochemical profile of serum was established. The lowest BW, regardless of age, had hens. From 18th week capons had the highest BW and finally it was similar to cocks. Cocks demonstrated, significantly, the highest carcass yield, however, the biggest proportion of breast muscles were stated in capons carcasses. The effect of sex is very clear in case of abdominal fat pad. The highest proportion of it was found in females but the lack of sex hormones in capons also contributed to a higher fat accumulation. The serum profile showed that the sexual maturity of hens increased lipids content (cholesterol, trigliceroles) caused by laying production.
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The surgical castration of male chickens induces hormonal changes, which permanently influence metabolic processes in birds. The aim of this study was to determine the effect of age and castration on ...the growth rate, feed conversion, lipid profile and histopathological changes in the livers of cockerels and capons. The experimental materials comprised male chickens of the Green-legged Partridge breed (old traditional Polish chicken breed), raised to 28 weeks of age. At 8 weeks of age, 100 birds were castrated. Caponization had a significant effect on the plasma concentrations of total cholesterol, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol and triacylglycerols (P<0.05). Fatty degeneration and lymphoid cell infiltration were observed more frequently in the livers of capons than cockerels. Capon carcasses were characterized by increased deposition of abdominal and subcutaneous fat (P<0.05). Total meat weight in the carcasses of cockerels and capons was similar, but the proportions of muscles were different. From 20 weeks of age, the weight of breast muscles was higher, and the weight of leg muscles was lower in capons than in cockerels (P<0.05). Capons were characterized by higher liver weight, higher gizzard weight and lower heart weight than cockerels (P<0.05). The feed conversion ratio (kg/kg BW) was similar in intact cockerels and capons. The values of carcass quality parameters and feed conversion ratio as well as histopathological changes in the liver indicate that Green-legged Partridge capons should be slaughtered at 20 to 24 weeks of age.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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