Study on Energy Requirement of Huanghuai Goat Ram in Growing Period
To clarify the energy requirement of Huanghuai goat ram during the growing period,fifty healthy 6-month-old Huanghuai goat rams(about 30 kg)were randomly divided into five groups,A,B,C,D and E,with 10 goats in each group.They were fed diets with metabolic energy(ME)levels of 8.02,8.71,9.40,10.08 and 10.76 MJ/kg respec-tively.The pre-trial period was 15 d and the trial period was 30 d.The results showed as follows:①With the increase of dietary energy level,the average daily gain(ADG)and dry matter intake(DMI)of Huanghuai goat ram in growing pe-riod showed a trend of increasing at first and then decreasing.The ADG of group C was the highest and there was a sig-nificant difference compared to other groups(P<0.05),and its DMI was significantly higher than that of A,B and E(P<0.05).F/G(the ratio of dry matter intake to total weight gain)between groups showed significant difference(P<0.05),and F/G of group C was the lowest.②CP apparent digestibility in group C was significantly higher than groups A,B,D and E(P<0.05).Ash apparent digestibility in groups B and C were significantly higher than group A(P<0.05),ADF apparent digestibility in group E was observably higher than group A(P<0.05),and P apparent digestibi-lity in groups B,C,D,and E were significantly higher than that of group A(P<0.05).③GEI,CH4E,ME,DE in groups C,D,E were significantly higher than groups A and B(P<0.05).④The regression analysis of ME,ADG(g)and meta-bolic weight(W0.75,kg)of Huanghuai goat ram in growing period was carried out,and the formula for its metabolic en-ergy requirement was ME(MJ/D)= 0.274W0.75+0.048 5ADG(R2=0.825).Therefore,under the conditions of this study,the suitable dietary energy level for Huanghuai goat ram is 9.40 MJ/kg,and the energy requirement for maintaining metabolism is 0.274 MJ/(kg W0.75·d).
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