Research Articles

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Browsing Research Articles by Subject "Feeding Carcass"

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    Effect of restricted feeding and season on the carcass chemical composition of Koekoek chickens
    (International Journal of Applied Poultry Research, 2014) Molapo, S. M.; Webb, E. C.
    The main objective of the study was to determine the effect of restricted feeding and season on carcass chemical composition of Koekoek chickens. Two hundred and seventy hens and 27 cocks were used. The experiment was designed as a factorial of two seasons and four feeding regime treatments. The four treatments were AA, AR, RA and RR. Each treatment had seven replicates (10 birds per replicate) with an exception of RR treatment which was replicated six times (10 birds per replicate). Data was collected at 18 and 32 weeks of age. At the age of 18 weeks, feed restriction had an impact on dry matter, fat and crude protein percentage. At 32 weeks of age, birds that were fed restrictedly had reduced fat content and increased crude protein. The lowest crude protein percentage was recorded in chickens that were allocated to full feeding for the entire study (AA). Chickens that were allotted to summer treatment had a higher dry matter and crude protein content than chickens that were in winter treatment at 18 weeks of age. Koekoek chickens that were in summer and winter treatments performed differently in terms dry matter, ash, crude fat and crude protein percentages at the age of 32 weeks. It is therefore, concluded that restricted feeding coupled with rearing chickens in winter resulted in lean carcass with more protein.
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    Effect of restricted feeding on carcass characteristics of Koekoek chickens
    (Anim. Vet. Sci, 2014) Molapo, S. M.; Webb, E. C.
    An experiment was conducted to evaluate the impact of feed restriction on carcass characteristics of Koekoek chickens. Two hundred and seventy hens and twenty seven cocks were randomly allocated to four feeding level treatments in a completely randomized design in chickens were full-fed in the rearing and laying phases (AA), chickens were full-fed in the rearing phase and restricted fed during the laying phase (AR), chickens were fed restricted feeding in the rearing phase and full-fed in the laying phase (RA) and chickens were fed restrictedly during the rearing and laying phases (RR). Each treatment had seven replicates (10 animals per replicate) with the exception of RR treatment which had six replicates (10 animals per replicate). Collected data was subjected to SPSS (17.00) package and analyzed by using analysis of variance (ANOVA). In the rearing phase, feed restriction resulted in reduced slaughter weight, dressing weight, skin weight, breast muscle weight, shank width, chest width and heart girth (P<0.05). Abdominal fat weight was higher (P<0.05) in chickens that were full-fed. At the age of 32 weeks, the effect of compensatory growth was prominent in chickens that that were subjected to RA treatment in a number of carcass traits. It is concluded that full feeding only in the laying phase (RA) would be the appropriate feeding management technique if chickens were to be slaughtered in the laying phase.