猪三元杂交体系中不同二元母本繁殖性能的研究

利用长×约7头,长×杜7头杂交母猪分别与杜洛克和大约克公猪生产三元杂交猪,着重研究约×(长×杜),杜×(长×约)三元杂交体系中,长×杜和长×约杂交母猪的繁蕴性能。研究表明:长×约、长×杜杂交母猪繁殖性能各指标均达到较好水平,第二胎产仔数、泌乳力(21日龄窝重)、断奶窝重,二组合分别达到13.5和11.75头、61.83和60.28kg、130.53和130.51kg。综合繁殖性能各指标,长×约杂交母本优于长×杜母本,特别是在产仔性能上长×约母本表现突出。因此,杜×(长×约)应是三元杂交猪推广的首选组合。约×(长×杜)组合中长×杜母本繁殖性能表现不差,三元后代哺乳期长势较好,终端父本约克夏猪适应能力强,毛色易于农户接受并与以往的杂交生产具备兼容性,也不失一个良好的杂交组合。

The studies on reproduction of two-way cross brood sow in three-way cross system

The three way cross was obtained by hybridization be-tween7brood sows from Landrace x yorkshire and Duroc boar,7brood sows from Landrace x Daroc and yorkshire boar.Thereproduc-tion performance of those two-way cross brood sows was studied in this experiment.The results showed that the brood sows from Lan-drace x yorkshire and Landrace x Duroc havehigh performance in re-production such as litter size of secondary foetus,Litter weight in21days,litter weight in weaning and were respectively13.5and11.75weavers,61.83and60.28kilogram,130.53and130.51kilo-gram.To sum up,the reproduction performance of brood sowsfrom Landrace x Yorkshire were better than brood sows from Landrace x Duroc.So thethree-way cross Duroc x(Landrace x yorkshire)in the best hybridized combination.But thehybridized combination york-shire x(Landrace x Duroc)popularize in rural area because ofthree-way cross in breast-feed with good growth and so on.