摘要
为了探讨东佛里生羊作为父本对湖羊的杂交改良效果,试验以东佛里生羊(31只)、东佛里生(♂)×湖羊(♀)杂交一代(F1代,204只)、东佛里生(♂)×湖羊(♀)级进杂交二代(F2代,156只)、湖羊(45只)4个试验群体为研究对象,测定了东佛里生羊、F1代和F2代8个月的泌乳量和湖羊3个月的泌乳量,计算4个试验群体的月泌乳量、周泌乳量、总泌乳量和日均泌乳量;分析品种、产羔数、胎次和年龄对母羊泌乳量的影响,比较Wood模型、Wilmink模型和逆多项式模型对4个试验群体泌乳曲线的拟合度(R2),筛选拟合度最高的模型拟合4个试验群体的泌乳曲线。结果表明:东佛里生羊总泌乳量和日均泌乳量分别为(243.19±1.64)kg和(1.01±0.05)kg,显著高于F1代[(227.54±0.61) kg和(0.95±0.02)kg]、F2代[(230.09±0.65)kg和(0.96±0.02)kg]和湖羊[(71.36±1.32) kg和(0.79±0.05)kg,P<0.05];F1代、F2代的总泌乳量和日均泌乳量均显著高于湖羊(P<0.05),其中日均泌乳量分别较湖羊提高了20.25%和21.52%。产羔数对4个试验群体的泌乳量影响均不显著(P>0.05),但产多羔母羊的泌乳量总体高于产单羔母羊。经产母羊的泌乳量总体高于初产母羊;5胎次母羊的日均泌乳量最大[(1.03±0.10)kg],显著高于其他胎次(P<0.05);1胎次母羊的泌乳量最小,为(0.93±0.02)kg。随着年龄的增长,母羊总泌乳量呈现增加趋势;1~4岁母羊的总泌乳量分别为(223.33±0.87)kg、(226.51±0.60)kg、(236.60±0.87)kg和(237.59±1.66)kg,日均泌乳量分别为(0.93±0.03)kg、(0.94±0.02)kg、(0.99±0.03)kg和(0.99±0.06)kg, 3,4岁母羊的总泌乳量、日均泌乳量均显著高于1,2岁母羊(P<0.05);4岁母羊第1,3,4,6个月泌乳量均最大,而3岁母羊第2,5个月泌乳量最大。4个试验群体的Wood模型的R2均最大,由Wood模型可知东佛里生羊泌乳潜力最大,湖羊泌乳潜力最小;湖羊在第4周达到泌乳高峰,而东佛里生羊、F1代和F2代在第8周达到泌乳高峰。说明
In order to explore the hybridization improvement effect of East Frisian as the male parent on Hu sheep, four experimental populations of East Frisian(31), East Frisian(♂) × Hu sheep(♀) Hybrid Generation 1(F1, 204), East Frisian(♂) × Hu sheep(♀) Progressive Hybridization Generation 2(F2, 156) and Hu sheep(45) were used as the research objects. The milk yield of East Frisian sheep, F1 generation and F2 generation in 8 months and the milk yield of Hu sheep in 3 months were measured, and the monthly milk yield, weekly milk yield, total milk yield and daily average milk yield of the four experimental populations were calculated. The effects of population, lambing number, parity, and age on milk yield of ewes were analyzed. The fitting degree(R2) of the lactation curves of the 4 experimental populations by the Wood model, Wilmink model, and inverse polynomial model was compared. The model with the highest fitting degree was selected to fit the lactation curves of the four populations. The results showed that the total milk production and daily average milk production of East Frisian sheep were(243.193±1.635) kg and(1.013±0.052) kg, respectively, which were significantly higher than those of F1 generation([227.543±0.605] kg and [0.952±0.019] kg), F2 generation([230.091±0.652] kg and[0.962±0.021] kg) and Hu sheep([71.361 ± 1.316] kg and [0.785 ± 0.045] kg, P<0.05). The total milk production and daily average milk production of F1 and F2 were significantly higher than those of Hu sheep(P<0.05), and the daily average production was increased by 20.25% and 21.52%, respectively, compared with Hu sheep. The lambing number had no significant effect on milk production(P>0.05), but milk production of ewes with multiple lambs were higher than those of ewes with a single lamb. The milk production of multiparous ewes was significantly higher than that of primiparous ewes(P<0.05). The 5th parity ewe has the highest milk production(1.033±0.098)kg, which was significantly higher than that of other parities(P<0.05).
作者
张玉庭
郝志云
杨舒童
王龙斌
刘圆
郭世伟
王继卿
ZHANG Yuting;HAO Zhiyun;YANG Shutong;WANG Longbin;LIU Yuan;GUO Shiwei;WANG Jiqing(College of Animal Science and Technology/Gansu Key Laboratory of Herbivorous Animal Biotechnology/Gansu Engineering Lab of Genetic Improvement in Ruminants,Gansu Agricultural University,Lanzhou 730070,China)
出处
《黑龙江畜牧兽医》
CAS
北大核心
2024年第16期42-47,116,共7页
Heilongjiang Animal Science And veterinary Medicine
基金
甘肃省基础研究创新群体项目(22JR5RA829)
中央引导地方科技发展资金项目
兰州市科技计划项目(2021-1-162)
甘肃农业大学校级研究生联合培养基地项目(GAU2022-008)。
关键词
东佛里生羊
湖羊
杂交
泌乳量
胎次
年龄
泌乳曲线
East Friesian
Hu sheep
hybridization
milk yield
parity
age
lactation curve
