Gabrovska L, Ganovski Kh
Vet Med Nauki. 1986;23(1):58-64.
Two groups of female lambs--'hay' and 'concentrate'--of 10 animals each, equated in terms of age, breed, and live weight were given different rations from the age of two weeks to one year. The hay group was offered roughage ad libitum and concentrates up to 25 per cent of the total amount of feed. The concentrate group was given concentrates ad libitum and roughage up to 25 per cent of the total amount of the feed consumed. The body mass of the animals was measured every month. There was no differences in the live weight between the two groups up to the age of 6.5 to 7.5 months. Later on the concentrate group showed 1.52 kg higher weight. This difference rose with each following month, and at the age of one year it reached 10 kg. The curves of body mass growth for the two groups showed the same pattern up to the age of 7.5 months (the period of intense growth). Then the curve of the hay group slowed down its course, while that of the concentrate group continued its growth (a period of delayed growth and enhanced fattening, respectively). The growth of body mass exhibited a characteristic rhythm which was manifested regardless of the type of ration given ad libitum.
两组各有10只雌性羔羊——“干草组”和“精料组”，在年龄、品种和活重方面相当，从两周龄到一岁给予不同日粮。干草组随意采食粗饲料，精料供给量占总饲料量的25%。精料组随意采食精料，粗饲料供给量占所消耗饲料总量的25%。每月测量动物的体重。在6.5至7.5月龄之前，两组的活重没有差异。后来精料组体重高出1.52千克。这种差异逐月增大，到一岁时达到10千克。两组的体重增长曲线在7.5月龄（快速生长阶段）之前呈现相同模式。然后干草组的曲线减缓，而精料组的曲线继续增长（分别是生长延迟和育肥增强阶段）。无论随意采食的日粮类型如何，体重增长都呈现出一种特征性节律。
