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Effect of photoperiod on productive and reproductive performance of primiparous buffaloes
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Abstract: Fourteen primiparous buffaloes were used to evaluate the effect of long dally photoperiod on some productive and reproductive traits . The buffaloes were assigned to two groups (7 animals each) .The buffaloes were feed ration contained similar ingredients with the same proportion of concentrate feed mixture (CFM). berseem and rice straw. (RS) .Anima1s in group I exposed to long photoperiod (16 boon). While the animals in group 2 were in nanua1 day at autumn and winter. The present study was designed to test the hypothesis that a long daily photoperiod is associated with increased milk yield and circulating insulin-like growth factor-I (IGF-I) (A hormone that is gaIactopoietics in ruminants.) The long photoperiod increased milk yield relative to the nanua1 photoperiod (21.8 %) than buffaloes in nanua1 day . In addition. buffaloes exposed to a long photoperiod had greater circulating concentrations of IGF-I.
Somatotropein and Prolactin. but melatonin was opposite to the ambient natural photoperiod .
days open. number of service per conception. dry period and calving interval were shorter in group I than group 2 . The relationship between hormones and its components were concluded that lactating buffaloes kept under a long photoperiod during autumn and .winter increased milk yield. circulation hormone. However. long photoperiod led to improvement of productive and reproductive performance and also increased the economic efficiency.
Key words: photoperiod. productive. reproductive and milk yield.
Abbreviation key: IGF-I :Insulin growth factor. ST: Somatotropin. TDN: Total digestible nutrition. DCP: Digestible protein, FCM: Fat corrected milk, TS: Total solid.
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| Publication year |
2004
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| Pages |
1537-1547
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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 |
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| City |
مشتهر
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| serial title |
Annals of Agricultural Science Moshtohor
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Milk yield.
Photoperiodicity.
Production.
Reproductive performance.
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| Proposed Agrovoc |
primiparous buffaloes;
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| Publication Type |
Journal
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