Factors Influencing Dairy Cattle Longevity
نویسندگان
چکیده
منابع مشابه
Longevity in Dairy Cattle
Longevity of productive life in dairy cattle is a characteristic difficult to evaluate. This measurement is complicated, in part, because the phenotype is expressed late in the life of the animal, but also because the methods of evaluation are complex. The molecular bases of longevity are still far from being fully understood, although some genes begin to be associated with this characteristic....
متن کاملFactors Influencing the Blood-sugar Level of Dairy Cattle
The sugar of the blood of dairy animals has been the subject of considerable investigation in its relation to milk secretion and disease. It is the precursor of the lactose of milk. Meigs (11)^ has presented a thorough review of the literature on this little-known phase of metabolism. There is good evidence to show that milk sugar is derived from the glucose of the blood, though the process by ...
متن کاملNon-genetic factors influencing sow longevity
The way that sows are housed during gestation and lactation has moved towards more intensive systems so that sows can be more easily managed and production maximized. At a minimum, some of these factors have contributed to a decline in the productive life of sows in commercial pork production systems. A sow remaining in the breeding herd for fewer parities is likely to produce fewer pigs in her...
متن کاملNon-genetic factors influencing sow longevity
The way that sows are housed during gestation and lactation has moved towards more intensive systems so that sows can be more easily managed and production maximized. At a minimum, some of these factors have contributed to a decline in the productive life of sows in commercial pork production systems. A sow remaining in the breeding herd for fewer parities is likely to produce fewer pigs in her...
متن کاملGenetic Aspects of Fertility and Longevity in Dairy Cattle
The aim of this thesis was to explore conditions for selection and genetic improvement of fertility and longevity in dairy cattle. The background is that single-trait selection for milk production is known to lead to impaired fertility and consequently to shorter lifespan. This in turn results in financial losses and ethical concerns. Since many years, the Swedish dairy farmers have recorded mi...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1960
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(60)90175-2