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Simulated effects of changing strategies on production performance of gobra zebu cattle


Agricultural Systems 23(4): 277-286
Simulated effects of changing strategies on production performance of gobra zebu cattle
Analyses of various management strategies available for the production of Gobra Zebu cattle at Dahra Research Station [Senegal] were conducted using a dynamic cattle production simulation model. Growth, milk production, forage and management characteristics collected at the station were the major input data used. Effects of the management strategies on production performances were predicted by examining changes in breeding season, breeding age, weaning age and supplementation regimes on productivity indices. The indices used were efficiency of nutrient utilization (ENU), defined as liveweight sold per 100 kg DM consumed, and cow productivity index (CPI), defined as liveweight sold per cow exposed. When females were exposed to calve first at 3 years of age, the ENU (94.4) and CPI (4.04) were highest for breeding from September to November and lowest (77.93 and 3.43, respectively) for breeding from July to September. Weaning at 7 months of age resulted in the highest ENU and CPI (94.89 and 3.95) while weaning at 5 months generated the lowest ENU and CPI (83.93 and 3.58). Among all feeding alternatives, the highest EMU (105.84) and CPI (4.21) were obtained when the entire cow herd was supplemented from May to July. Supplementation of mature cows only was the most desirable strategy among the selective supplemental feeding practices wiht regard to cow age classes. Results provided valuable guidelines for selecting management practices likely to increase Gobra Zebu productivity.


Accession: 006418175

DOI: 10.1016/0308-521X(87)90048-5



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