Abstract
Effects of Temperature, Photoperiod and Food Quantity on Body Mass and Thermogenesis in Apodemus chevrieri
Highlights
The aim of this research was to determine the relationship between age at first calving (AFC) and first lactation milk yield [adjusted 305-day (MY305)], reproductive performance [days open (DO), calving interval (CI)] and diseases in Simmental dairy cows bred under Turkey conditions
It has been reported that calving at very early age may adversely affect milk performance and that heifers are more susceptible to certain health issues, especially dystocia, due to the fact for some breed and breeding systems, various research has shown that calving between 22-24 months in order to reduce breeding costs is suitable without any adverse effects on milk yield and animal health throughout the heifer’s productive life (Hoffman, 1997; Nilforooshan and Edriss, 2004)
The aim of this study was to determine the relationship between age at first calving (AFC) and milk yield adjusted 305 days (MY305), reproductive performance and animal health in Simmental dairy herds in terms of providing the optimal balance between economic benefit, animal health and milk yield and increase the success of herd management practices
Summary
The aim of this research was to determine the relationship between age at first calving (AFC) and first lactation milk yield [adjusted 305-day (MY305)], reproductive performance [days open (DO), calving interval (CI)] and diseases (lameness, mastitis, metritis and dystocia) in Simmental dairy cows bred under Turkey conditions. Provide of the optimal balance between economic benefit, animal health and milk yield is mandatory. The aim of this study was to determine the relationship between age at first calving (AFC) and milk yield adjusted 305 days (MY305), reproductive performance and animal health in Simmental dairy herds in terms of providing the optimal balance between economic benefit, animal health and milk yield and increase the success of herd management practices .
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