Koketsu Y, Dial G D
Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.
J Am Vet Med Assoc. 1997 Oct 1;211(7):894-8.
To determine factors associated with weaning-to-mating interval among sows on commercial farms that wean pigs early.
Cohort study.
11,861 farrowing sows.
Production, farrowing, and feed intake records were reviewed for sows on 16 farms for which mean duration of lactation was between 14.9 and 18.9 days.
Among sows with high feed intake during lactation (> or = 5.6 kg/d [12.3 lb/d]), lactation duration was not associated with weaning-to-mating interval, but among sows with low feed intake during lactation (< 5.6 kg/d), weaning-to-mating interval increased as lactation duration decreased. Furthermore, among sows with the lowest feed intake during lactation (< 4.2 kg/d [9.2 lb/d]), those that had heavier litter weights at weaning (> 54 kg [119 lb]) had a longer weaning-to-mating interval than did those that had lighter litter weights at weaning. Sows with low feed intake and high litter weight at weaning accounted for 5 to 20% of sows on each farm. In general, weaning-to-mating interval increased as parity decreased, but the change in weaning-to-mating interval associated with a particular change in lactation duration varied with parity.
When feed intake during lactation is maximized (> or = 5.6 kg/d), lactation duration is not significantly associated with weaning-to-mating interval. Producers should consider fostering or partially weaning litters when sows with high litter weights are not consuming sufficient feed.
确定商业农场中提前断奶母猪断奶至配种间隔的相关因素。
队列研究。
11861头分娩母猪。
回顾了16个农场母猪的生产、分娩和采食量记录，这些农场母猪的平均泌乳期在14.9至18.9天之间。
泌乳期采食量高（≥5.6千克/天[12.3磅/天]）的母猪，泌乳期长短与断奶至配种间隔无关，但泌乳期采食量低（<5.6千克/天）的母猪，断奶至配种间隔随泌乳期缩短而延长。此外，泌乳期采食量最低（<4.2千克/天[9.2磅/天]）的母猪中，断奶时仔猪体重较重（>54千克[119磅]）的母猪，其断奶至配种间隔比断奶时仔猪体重较轻的母猪更长。泌乳期采食量低且断奶时仔猪体重高的母猪占每个农场母猪的5%至20%。一般来说，断奶至配种间隔随胎次降低而延长，但与泌乳期特定变化相关的断奶至配种间隔变化随胎次而异。
当泌乳期采食量最大化（≥5.6千克/天）时，泌乳期长短与断奶至配种间隔无显著关联。当仔猪体重高的母猪采食量不足时，生产者应考虑寄养或部分断奶仔猪。
