Sahlu T, Fernandez J M, Potchoiba M J
Langston University, Oklahoma 73050.
J Dairy Sci. 1992 Jan;75(1):220-7. doi: 10.3168/jds.s0022-0302(92)77756-x.
An experiment was conducted utilizing 44 Alpine does (48 kg of BW) to examine the effects of dietary protein intake on nutritional status and performance of does during the latter half of pregnancy and parturition. All dry does were bred, confirmed pregnant, and fed a diet containing 9% CP and 2.04 Mcal of metabolizable energy/kg of DM through wk 11 of gestation. On wk 12, does were blocked by BW and assigned to one of three dietary treatments: 8.8% (low) CP, 11.0% (medium) CP, and 14.3% (high) CP. All diets were isocaloric (2.04 Mcal of metabolizable energy/kg of DM) and fed for ad libitum intake from wk 12 of gestation until parturition. Average CP intakes for low, medium, and high protein were 164, 220, and 303 g/d, respectively. Body weight gains increased with increasing CP intake. Kidding rates were 79, 100, and 93% for the low, medium, and high protein groups. Gestation length, litter size, and litter weight did not differ among treatment groups. Urea N in jugular blood plasma increased with increasing CP intake. Plasma glucose and whole blood beta-hydroxybutyrate tended to increase with increasing CP intake. Plasma glucose decreased 7, 6, and 3%, and NEFA increased 97, 400, and 187% between wk 13 and 21 of gestation for the low, medium, and high protein diets, respectively. The data suggest that the low protein diet may be inadequate to meet the does' protein requirement during late gestation, but there was no apparent advantage in feeding the high rather than medium protein diet. Intake of CP for the medium protein diet, 9.8% g/kg of BW.75, was 40% higher than that recommended by the NRC for pregnant goats.
进行了一项实验，使用44只阿尔卑斯母羊（体重48千克）来研究孕期后半段和分娩期间日粮蛋白质摄入量对母羊营养状况和生产性能的影响。所有空怀母羊配种后确认怀孕，并在妊娠第11周前饲喂含9%粗蛋白（CP）和2.04兆卡代谢能/千克干物质（DM）的日粮。在第12周，母羊按体重进行分组，并分配到三种日粮处理之一：8.8%（低）CP、11.0%（中）CP和14.3%（高）CP。所有日粮能量相等（2.04兆卡代谢能/千克DM），从妊娠第12周开始自由采食直至分娩。低、中、高蛋白组的平均CP摄入量分别为164、220和303克/天。体重增加量随CP摄入量的增加而增加。低、中、高蛋白组的产羔率分别为79%、100%和93%。各处理组之间的妊娠期长度、产仔数和窝重没有差异。颈静脉血浆中的尿素氮随CP摄入量的增加而增加。血浆葡萄糖和全血β-羟基丁酸倾向于随CP摄入量的增加而增加。对于低、中、高蛋白日粮，在妊娠第13周和第21周之间，血浆葡萄糖分别下降了7%、6%和3%，非酯化脂肪酸（NEFA）分别增加了97%、400%和187%。数据表明，低蛋白日粮可能不足以满足母羊妊娠后期的蛋白质需求，但饲喂高蛋白日粮而非中等蛋白日粮并没有明显优势。中等蛋白日粮的CP摄入量为9.8克/千克体重0.75，比美国国家研究委员会（NRC）推荐的怀孕山羊摄入量高40%。
