| Titles |
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English :
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The productive and reproductive efficiency of cow baladi heifers under different levels of nutrition
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Arabic :
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الكفاءة الأنتاجية و التناسلية لعجلات الأبقار البلدية تحت مستويات مختلفة من التغذية
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| Abstract |
Twenty four pre-pubertal Baladi heifers were used to investigate the effects of three varying feed recommendations during pre- and post-puberty period on subsequent growth and reproduction performances. Heifers were allotted to receive (G1) 100% of National Research Council (NRC, 1988), 100 % and 120% of Shehata, 1972 allowances for G2 and G3), respectively. Heifers were fed their respective diets in groups and observed for estrous behavior. The average daily gains (ADG) during the experimental period differed among groups and were 0.527, 0.563 and 0.638 kg for G,1 G2 and G3) respectively. Heifers of G1 prolonged age at puberty and sexual maturity and caused lower first service conception rates. Average of blood serum parameters (glucose, total protein. albumin and globulin concentrations) were affected for animals that fed by Shehata allowances However cholesterol showed the reverse trend of the previous parameters. Average serum progesterone concentration as indicated by the area over the second estrous cycle tended to be significantly low in the low-fed group (NRC). The present results indicate that energy and protein intake offered during pre- and post-pubertal period have an effective role on growth and ovarian activity in Baladi heifers. From economical point of view use of G2 could be recommended to improve the growth and reproductive performance of Baladi heifers.
Keywords: Baladi heifers, daily gain, reproduction, and economic efficiency.
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| Publication year |
2014
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| Pages |
51-61
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- دقى- جيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| Country |
Egypt
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| serial title |
Egyptian Journal of Nutrition and Feeds
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| ISSN |
1110-6360
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| Volume |
17
. 1
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Growth rate.
Heifers.
Profit.
Reproduction.
Sexual maturity.
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| Publication Type |
Journal
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