青山羊泌乳期母羊的能量需要量研究

选用24只青山羊泌乳母羊,用饲养试验、消化代谢试验、比较屠宰试验及气体能量代谢试验等手段,研究其能量需要量。结果表明,在本试验条件下,试羊的能量表观消化率和代谢率分别为70.4％和85.0％,甲烷能占总能进食量(GEI)的9.20％。维持代谢能需要为502W~(0.75)KJ/天,每产一千克标准乳(FCM)需5060KJ泌乳代谢能。泌乳母羊的维持效率(K_m)为0.845,泌乳效率(K_1)为0.635,热增耗占GEI的14.34％。青山羊泌乳期母羊的代谢能总需要量(MERKJ/天)可按下式求得MER=502W~(0.75)+5060·FCM或:MER=502W~(0.75)+1.578NEL(式中:W~(0.75):kg;FCM:kg/天;NEL:kJ/天)。

A STUDY ON REQUIREMENT FOR LACTATING GREEN GOATS

Twenty-four lactating Green goats were used to study the energy requirement by feeding trial, digestion and metabolism experiments, comparative slaughtering and indirect respiration calorimetric experiments. The results acquired showed that the apparent digestibility of gross energy was 70.4%, and the metabolic rate of digestible energy was 80.5%. The estimated amount of methane was 9.20% of gross energy intake. The metabolizible energy required for maintenance was 502W0.75 KJ per day, and for lactation was 5060KJ per kilogram of fat corrected milk. The efficiency of utilization of metabolizible energy for maintenance and lactation were 84.5% and 63.5%, respectively. Heat increment was 14.3% of gross energy intake. The total metabolizible energy required (MER, KJ/day) for lactating Green goats can be estimated by the follow equation. MER = 502W0.75 + 5060FCM or: MER = 502W0.75 + 1.578NEL, where W0.75-metabolic weight (kg), FCM-fat corrected milk (kg/day), NEL-net energy for lactation (KJ/day).