摘要
对13年间2769头母畜配种资料的统计、分析结果表明,在神木县生态条件下,母畜平均初配年龄为牛2.30岁、马2.65岁、驴2.63岁,发情周期为牛22.03天、马22.34天、驴22.90天,发情持续期为牛2.30天、马7.62天、驴5.64天;单相关分析表明光、热二因子对繁殖性状的作用方向是一致的,其中与发情季节和受胎率均为正的相关,而与发情周期和发情持续期均为负相关,但作用的程度在不同畜种间有差异;复相关分析揭示了二因子对繁殖性状共同作用的程度,结果表明除对牛发情持续期的影响较弱(R=0.149)外,与其余各畜种各性状间的相关程度均在中等以上(R=0.494～0.997),但显著水平则不尽一致。本文所采用的复相关分析可给人以时空上的整体概念,在生产中更具有实际意义。
The stattstic analysis for the mating records of 2769 females in 13 years showed that,on the ecological conditions of shengmu conuty,the average first mating age for cows,mares and jennets was 2.30 2.65 and 2.63 years old respectively;estrus cycle was 22.03,22.34 and 22.90 dags respectively and estrus durations was 2.3o,7.62 a-d 5.64 days respectively.The simple correlation ana lysis discovered that the effects of light and heat on the reproductive traits had the same trend:both light and heat had positive correlation with estrus season and pregnant rate,and negative correlatiou with estrus cycle and estrus duration,but the degree of the above correlations varied among different kinds of animals.The multiple correlation analysis susgested that the mu ltiple correlation coefficients light and heat with the reproductive traits were above medium levels (R=0.494 ～0.997) except with estrus duration of cows (R=0.149),and the significant levels were not the same.The multiple correlation analysis used in the paper mi ght offer a whole concept based on chronological and space terms,and could play a more important role in practice.
出处
《家畜生态学报》
1992年第3期17-23,共7页
Journal of Domestic Animal Ecology
关键词
初配年龄
发情周期
发情持续期
发情季节
受胎率
First mating age
Estrus cycle
Estrus duration
Estrus season
Pregnant rate
