| Titles |
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English :
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Effect of dry-period length on days open of the subsequent lactation during the first four parities of Holstein cows in Egypt
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Arabic :
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تأثير طول فترة الجفاف على فترة الايام المفتوحة لموسم الحليب التالى خلال مواسم الحليب الاربعة الاولى لماشية الهولشتين المرباة في مصر
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| Abstract |
A total number of 3965 records for 1029 Holstein cows distributed in 3 herds was used in the present work to study the influence of days dry on the length of days open of the subsequent lactation as a measure of cow's fertility during the first four parities of Holstein cows raised under commercial farm conditions in Egypt. The statistical model included herd, year and season of calving and parity and dry period category as fixed effects. Dry period included 11 levels: <30 d, 31-40 d, and then incrementally by 10 days to 111-120 d, while the last category included dry periods between 121-138 d. All effects contributed significantly to variation in days open of the subsequent lactation. Least squares means for days open increased gradually and significantly with the increase of days dry of the previous lactation. Thus, shortening the dry period appeared to increase reproductive efficiency by shortening time to conception and improving fertility. A dry period of between 31 and 50 days length allowed minimizing days open of the subsequent lactation. Future studies at more locations with varying reproductive management strategies are needed to confirm this conclusion.
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| Publication year |
2009
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| Pages |
382-390
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| serial title |
Egyptian Journal of Applied Science
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| Author(s) from ARC |
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| Agris Categories |
Animal husbandry
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AGROVOC
TERMS |
Cows.
Egypt.
Fertility.
Herds.
Lactation.
Parturition.
Seasons.
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| Proposed Agrovoc |
days dry;dry period category;
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| Publication Type |
Journal
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