Doolittle D P, Newman S, Croak-Brossman S J, Harris D L
Growth. 1984 Summer;48(2):138-47.
Mice from three outbred stocks (PGH, J, and SWO) were fed either pelleted feed from overhead hoppers or ground feed from jars, from weaning at 21 days old to slaughter at 42, 49 or 56 days old. Live weights, weights of carcasses before and after extraction of carcass moisture and fat, and feed consumption were recorded. The PGH stock gained more in dry lean tissue and deposited less fat, and had a greater feed efficiency, compared to either of the other stocks. Males gained more than females, in both dry lean tissue and fat; females had a higher proportion of lean tissue and a greater feed efficiency. Increases in live weight between 49 and 56 days of age were mainly increases in fat content, especially in the offal portion of the body. Jar feeding restricted feed intake and reduced live weight gains. The reduction, however, was principally in fat deposition; feed efficiency was also greater for jar fed mice. It was found that the amount of lean tissue could be accurately predicted from carcass weight and carcass moisture measurements. It may be possible to estimate lean tissue accurately without employing the expensive and time consuming process of either extraction.
来自三种远交系小鼠（PGH、J和SWO）从21日龄断奶到42、49或56日龄屠宰期间，分别喂食来自高架料斗的颗粒饲料或来自罐子的磨碎饲料。记录了小鼠的活体重、去除胴体水分和脂肪前后的胴体重量以及饲料消耗量。与其他两种品系相比，PGH品系在干瘦组织中增重更多，脂肪沉积更少，且饲料效率更高。雄性在干瘦组织和脂肪方面的增重均超过雌性；雌性的瘦组织比例更高，饲料效率也更高。49至56日龄之间活体重的增加主要是脂肪含量的增加，尤其是在身体的内脏部分。罐子喂食限制了采食量并降低了体重增加。然而，体重减轻主要是脂肪沉积减少；罐子喂养的小鼠饲料效率也更高。研究发现，可以通过胴体重量和胴体水分测量准确预测瘦组织的量。或许有可能在不采用任何一种昂贵且耗时的提取过程的情况下准确估计瘦组织。
