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首页> 外文期刊>Animal Reproduction Science >Split weaning increases the incidence of lactation oestrus in boar-exposed sows
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Split weaning increases the incidence of lactation oestrus in boar-exposed sows

机译：断奶断奶增加公猪暴露母猪泌乳发情的发生率

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This study evaluated the effect of split weaning and fence-line boar exposure during lactation on the incidence of lactation oestrus. Large White and Large White x Landrace sows (parity 2.9+/-0.17; mean +/-SEM) were housed in conventional farrowing crates from day 4 to 30 post-parturition. Four treatments (n = 18) were used: control (SPW0): continuous lactation of 10 piglets with all piglets weaned on day 30 of lactation; and three split wean (SPW) treatments with 3 (SPW3), 5 (SPW5) or 7 (SPW7) of the heaviest piglets removed from the sow on day 18 lactation. From day 18 lactation all sows received 15 min daily, fence-line boar exposure in a detection mating area. Fewer sows in the SPW0 treatment (56% (10/18)) expressed a lactation oestrus compared to the SPW3, SPW5, and SPW7 treatments (83%; 89%; 94%, respectively). SPW0 sows had a lower subsequent total born compared to SPW5 or SPW7 sows (8.9 +/- 1.1 vs. 12.5 +/- 1.0 and 13.1 +/- 1.1, respectively). Between day 18 and 30 of lactation, sows in SPW5 and SPW7 gained weight (4.5 +/- 1.4 and 1.9 +/- 1.4 kg, respectively) whereas SPW0 and SPW3 sows lost weight (4.9 +/- 1.4 and 2.9 +/- 1.4 kg, respectively) (P<0.05). Split weaned piglets were heavier at day 17 of age by 1.0 kg however by day 40 of age no weight differences were observed between piglets weaned on day 18 compared to day 30 (P<0.05). In conclusion, split weaning coupled with fence-line boar exposure in late lactation induced lactation oestrus in a higher proportion of sows compared to those suckling a normal litter size.
机译：这项研究评估了泌乳期间断奶断奶和栅栏公猪暴露对哺乳期发情的影响。从分娩后的第4天到第30天，将大白和大白×长白母猪（均价2.9 +/- 0.17;均值+/- SEM）放在常规的分娩箱中。使用了四种处理方法（n = 18）：对照（SPW0）：连续泌乳10头仔猪，所有仔猪在泌乳第30天断奶。在哺乳第18天时，从母猪中取出3只（SPW3），5只（SPW5）或7只（SPW7）最重的仔猪进行三段断奶（SPW）处理。从哺乳第18天起，所有母猪每天在检测交配区接受15分钟的栅栏公猪暴露。与SPW3，SPW5和SPW7处理相比，SPW0处理的母猪表达泌乳期的比例较低（56％（10/18））。与SPW5或SPW7母猪相比，SPW0母猪的随后总出生数较低（分别为8.9 +/- 1.1和12.5 +/- 1.0和13.1 +/- 1.1）。在哺乳期的第18天至第30天之间，SPW5和SPW7的母猪体重增加（分别为4.5 +/- 1.4和1.9 +/- 1.4 kg），而SPW0和SPW3的母猪体重减轻（4.9 +/- 1.4和2.9 +/- 1.4分别为（kg

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