【摘 要】
：
Holsteins were first imported to Tunisia in the early 1970s when they represented 6％ of a total of 450,000 cows.In 2011,they represented 52％ of almost the same total cow population as in the 1970s.Ear
【机 构】
：
Laboratoire des Ressources Animales et Alimentaires.Institut National Agronomique de Tunisie(INAT)10
【出 处】
：
第11届世界畜产大会(WCAP2013)
论文部分内容阅读
Holsteins were first imported to Tunisia in the early 1970s when they represented 6％ of a total of 450,000 cows.In 2011,they represented 52％ of almost the same total cow population as in the 1970s.Early attempts to study yield and reproductive performance of imported dairy cattle under Northern African conditions were conducted on a small scale during a short recording period.
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