Hagan J K, Etim N N
Department of Animal Science, University of Cape Coast, Cape Coast, Ghana.
Department of Animal Science, Obio Akpa Campus, Akwa Ibom State University, Obio Akpa, Akwa Ibom State, Nigeria.
Trop Anim Health Prod. 2019 Feb;51(2):411-418. doi: 10.1007/s11250-018-1705-5. Epub 2018 Sep 8.
A research aimed at evaluating the reproductive performance of pigs as influenced by breed, season, and parity was carried out. Reproductive performance records of 1383 sows made up of 204 primiparous and 1179 multiparous large white (687) and Duroc × large white crosses (696) obtained over a 3-year period (2013 to 2016) were used. Data on reproductive performance taken were farrowing rate, litter size at birth and at weaning, piglet weight at birth and at weaning farrowing interval and pre-weaning mortality. To determine the effect of season, parity and breed on reproductive performance, the 4-way analysis of variance (ANOVA) was used. A mixed model was fitted using the generalized linear model (GLM) procedure of the GenStat (Discovery Edition) to investigate the fixed effects of breed (two classes), season of birth (three classes) and parity (five classes) on the reproductive traits. Where differences in means were observed, the means were separated using the least significant difference at 5% level of significance. Results obtained indicated litter size at birth of 12.5 ± 0.3 and 14.2 ± 0.5 for the large white and the Duroc × large white respectively and farrowing rates of 90.0 ± 2.3 and 94.5 ± 2.5% for the large white and the Duroc × large white respectively. Litter size at birth and at weaning, farrowing rate and piglet weight at birth were all influenced by parity and season with increasing parity significantly reducing litter size at birth and at weaning. Reproductive traits of the sows were superior during the rainy season, an indication of the need to consider season of birth in making decision.
开展了一项旨在评估品种、季节和胎次对猪繁殖性能影响的研究。使用了在2013年至2016年3年期间获得的1383头母猪的繁殖性能记录，这些母猪包括204头初产母猪和1179头经产母猪，由687头大白猪和696头杜洛克×大白杂交猪组成。所采集的繁殖性能数据包括产仔率、出生时和断奶时的窝仔数、出生时和断奶时的仔猪体重、产仔间隔和断奶前死亡率。为了确定季节、胎次和品种对繁殖性能的影响，采用了四因素方差分析（ANOVA）。使用GenStat（发现版）的广义线性模型（GLM）程序拟合混合模型，以研究品种（两类）、出生季节（三类）和胎次（五类）对繁殖性状的固定效应。在观察到均值差异的情况下，使用5%显著水平的最小显著差异来分离均值。获得的结果表明，大白猪和杜洛克×大白杂交猪出生时的窝仔数分别为12.5±0.3和14.2±0.5，产仔率分别为90.0±2.3%和94.5±2.5%。出生时和断奶时的窝仔数、产仔率和出生时的仔猪体重均受胎次和季节的影响，随着胎次的增加，出生时和断奶时的窝仔数显著减少。母猪的繁殖性状在雨季表现更优，这表明在做决策时需要考虑出生季节。
