Factors influencing heifer survival and fertility on commercial dairy farms
نویسندگان
چکیده
منابع مشابه
Factors influencing heifer survival and fertility on commercial dairy farms.
The average dairy cow survives only three lactations, reducing the availability of replacement heifers. Prenatal losses occur due to early embryonic mortality (about 40%), later embryo loss (up to 20% in high-yielding herds) or abortion (about 5%). A recent survey of 19 UK herds showed that 7.9% of calves were born dead and 3.4% died within 1 month. During the rearing phase, 6.7% of animals wer...
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ژورنال
عنوان ژورنال: Animal
سال: 2008
ISSN: 1751-7311
DOI: 10.1017/s1751731108002322