ABSTRACT The influence of feed or protein depletion–repletion on phosphorus balance, and bone characteristics was studied on 70 growing pigs from 90 to 168 d of age. During depletion period (90–118 d of age), C pigs were fed semi ad libitum (95% ad libitum intake) on control diet; FR pigs (feed-restricted group) consumed 40% less of control diet compared to C pigs; PR pigs (protein-restricted group) were fed semi ad libitum a low-protein diet containing 40% less protein than control diet. During repletion period (119–168 d of age), daily allowances for C pigs were equal of 95% ad libitum intake. Remaining pigs consumed a control diet at the same amount as C pigs. Pigs were slaughtered at 90 d of age (“zero” animals, n = 7), following seven animals from each group at d 118, 146 and 168 of age. At 118 d of age, phosphorus content in the body was lower (p < 0.001) in FR than C and PR pigs. Lower phosphorus deposition and utilisation was observed in FR animals. Humerus in FR pigs was lighter, had lower mineral content and density, but had greater stiffness than in PR and C pigs. During repletion period, FR pigs deposited more phosphorus and had better phosphorus utilisation than C and PR pigs. Humerus mineral density was greater in FR and PR than in C pigs. Humerus strength was the highest in PR pigs, and the lowest in FR pigs. Humerus stiffness was greater in PR than in C and FR pigs. In conclusion, during depletion period feed restriction affects bone growth more than protein restriction, and bone strength is less sensitive, than other bone characteristics, to feed restriction. Reductions in measured bone indices observed after lower feed intake can be fully compensated during the repletion period and resulted mainly from better utilisation of minerals.

中文翻译：

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生长后备母猪的骨矿化、机械特性和体内磷含量受消耗-补充期间蛋白质或饲料摄入量的影响

摘要 在 70 头 90 至 168 日龄的生长猪身上研究了饲料或蛋白质消耗-补充对磷平衡和骨骼特征的影响。在消耗期（90-118 日龄），C 猪半随意饲喂（95% 随意采食量）对照日粮；与 C 猪相比，FR 猪（饲料限制组）消耗的对照饮食少 40%；PR 猪（蛋白质限制组）半随意饲喂低蛋白质日粮，其蛋白质含量比对照日粮少 40%。在补充期（119-168 日龄），C 猪的每日摄入量等于 95% 的随意采食量。其余猪消耗与 C 猪相同量的对照饮食。猪在 90 日龄时被屠宰（“零”动物，n = 7），每组分别在 118、146 和 168 日龄时屠宰 7 头猪。在 118 天龄时，FR 猪的体内磷含量低于 C 和 PR 猪（p < 0.001）。在 FR 动物中观察到较低的磷沉积和利用。FR 猪的肱骨更轻，矿物质含量和密度较低，但比 PR 和 C 猪的硬度更大。在补充期间，FR猪比C和PR猪沉积更多的磷并且磷的利用更好。FR 和 PR 组的肱骨矿物质密度高于 C 组猪。PR猪的肱骨强度最高，FR猪的肱骨强度最低。PR 猪的肱骨硬度高于 C 和 FR 猪。总之，在消耗期间，限制饲料比限制蛋白质对骨骼生长的影响更大，并且与其他骨骼特征相比，骨骼强度对限制饲料的敏感性较低。