Factors Affecting Milk Yield and Reproductive Performance
نویسندگان
چکیده
منابع مشابه
Factors Affecting Yield and Composition of Milk
The variation in composition and daily yield of milk is a regular phenomenon in all milking animals. Broadly, the factors which are responsible for such variations can be divided into (1) Physiological, which will be governed by the genetical make up and (2) Environmental, such as age, number of previous lactations, pregnancy, nutrition status, etc. The dairyman has hardly got any control over ...
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Although the number of dairy farms is decreasing, that of large farms is increasing in Japan. Milk production in Japanese dairy cows has increased from 62 kg/year to 88 kg/year over the last 2 decades. However, Japanese dairy cows are experiencing a sustained decline in reproductive performance, calving intervals, and days open; further, the number of inseminations required for conception have ...
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Complete egg production data from a pair breeding flock located in South Africa were used to generate annual reproductive records for all hens exposed to breeding. Traits analysed included measures of total egg and chick production and related traits, along with egg and chick weights. Both genetic and non-genetic factors significantly influenced reproductive performance. Seasonal effects, durat...
متن کاملEvaluation of non-genetic factors affecting calf growth, reproductive performance and milk yield of traditionally managed Sheko cattle in southwest Ethiopia
The study was conducted to estimate calf growth, reproductive performance and milk yield of Ethiopia Sheko cattle and to assess non-genetic factors affecting their performance in their home tract as a step towards designing sustainable cattle conservation and improvement strategy. All the growth traits considered in the study were significantly affected by all non-genetic factors considered exc...
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A total of 1243 records of 585 dairy Friesian cows collected through 8 years (1997-2004) were used to study factors affecting retention of placenta and its influence on reproductive performance and milk production. The obtained results showed that the percentage of retained placenta averaged 24.90%, the highest percentage was in the year 1998 (46.3%) and it increased significantly (P<0.05) with...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1982
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(82)82302-3