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Effect of concentrate-forage ratio in diet on liveweight gain of stall-fed goats

LI Xiang-lin1,ZHANG Xin-yue2,TANG Yi-guo2,HE Feng1,ZHANG Jian-zhong1(1.The Institute of Animal Science,CAAS,Beijing 100094,China;2.Sichuan Grassland Service Station,Chengdu 610041,China)  
This paper reports an experiment on stall-feeding of goats in Hongya,Sichuan Province.The experiment consisted of three feeding phases with four groups of castrated Boer×Mayang goats(average age of 5 months) which were treated with different concentrate and forage ratios in the diets.Under the stall-feeding condition,total DM intake increased while forage DM intake decreased when the proportion of concentrate in the diet was increased,regardless of the forage type.Goat liveweight gain was very low with Hemarthria compressa based diet but was significantly increased by concentrate supplementation.Adding Medicago sativa hay to the H.compressa based diet resulted in lower goat liveweight gain in the first 2 weeks but a significant increase in liveweight gain in the later phase.The high cost of M.sativa hay nevertheless meant that this was not cost-effective for goat feeding.Lolium multiflorum based diets had the highest daily liveweight gain ranging from 130 to 189 g,with a carcase weight at the age of 10 months from 17.56 to 25.23 kg,dependent on concentrate ratio(12%-43%) in the diet.Despite the liveweight gain by increased concentrate supplementation,the extra cost led to a lower net income.It was concluded that L.multiflorum diet supplemented with 10% concentrate gave the best return of 0.64 Yuan/(Head·d).
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