Campbell R G, Johnson R J, King R H, Taverner M R
Animal Research Institute, Werribee, Victoria, Australia.
J Anim Sci. 1990 Sep;68(9):2674-81. doi: 10.2527/1990.6892674x.
Sixty crossbred pigs (Large White x Landrace) were used in a 2 x 2 x 2 factorial experiment to investigate the effects of gender (intact males vs females) and strain (A vs B) on the response to exogenous porcine growth hormone (pGH) administration (0 [excipient-treated] vs .1 mg pGH.kg live weight-1.d-1). All pigs had ad libitum access to their diet; pGH was administered daily from 60 to 90 kg live weight. All aspects of growth performance and body composition were affected to different degrees by gender and pGH. Strain A pigs had a higher capacity for protein accretion, superior growth performance and contained less fat in the eviscerated carcass and empty body compared with Strain B pigs. Within each strain, intact males ate more feed, had a higher rate of protein deposition and exhibited faster and leaner growth than females. Exogenous pGH administration increased average protein deposition and growth rate by 84 and 34%, respectively, and reduced average feed intake, fat deposition rate, feed:gain and carcass fat content by 14, 59, 37 and 33%, respectively. The magnitude of the changes in growth performance, tissue accretion rates and body composition elicited by pGH were independent of strain. However, within each strain the improvement in feed:gain and reduction in carcass fat measurements elicited by pGH were proportionately larger for females than for intact males.
60头杂交猪（大白猪×长白猪）用于一项2×2×2析因实验，以研究性别（未阉割公猪与母猪）和品系（A系与B系）对外源猪生长激素（pGH）给药（0 [赋形剂处理] 与0.1 mg pGH·kg体重⁻¹·d⁻¹）反应的影响。所有猪均可自由采食；pGH在体重60至90 kg期间每日给药。生长性能和身体组成的各个方面均受到性别和pGH不同程度的影响。与B系猪相比，A系猪具有更高的蛋白质沉积能力、更优的生长性能，且去内脏胴体和空体中脂肪含量更低。在每个品系内，未阉割公猪比母猪采食更多饲料，蛋白质沉积率更高，生长更快且更瘦。外源pGH给药分别使平均蛋白质沉积和生长速度提高了84%和34%，并分别使平均采食量、脂肪沉积率、料重比和胴体脂肪含量降低了14%、59%、37%和33%。pGH引起的生长性能、组织沉积率和身体组成变化的幅度与品系无关。然而，在每个品系内，pGH引起的料重比改善和胴体脂肪量减少对母猪的比例比对未阉割公猪更大。
