| Titles |
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English :
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Factors affecting somatic cell counts and their relations with milk Yield in Egyptian buffalo
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| Abstract |
A total of 3189 records for each of daily milk yield (DMY) and log10 SCC (LSCC) in the first three parities for 364 Egyptian buffalo raised at four experimental farms belonging to the Animal Production Research Institute, Egypt was used in this study. Data were collected at monthly intervals over the period from October 1999 to June 2004 to study non-genetic factors affecting DMY and LSCC, their trend along with the trajectory of DIM from 5 to 300-d and their phenotypic relationship.
The fixed model included herd-test date (HTD) effect, days in milk (DIM) (10 classes starting with 1 for DIM between 5 and 30-d and increased by 1 every 30 days along the trajectory up to 300-d). Age at calving within each parity was analyzed as a covariate. Another trail was made using herd-year-season (HYS) effect instead of HTD.
The results indicated that HTD had a highly significant effect (P<0.001) on both DMY and LSCC in all parities. Moreover, using HTD effect increased the accuracy of the model when compared with HYS effect. DIM had a highly significant effect (P<0.001) on DMY where it resulted non-significant for LSCC in the first three parities. Age at calving had a significant effect on both DMY and LSCC in the second and third parities, while it had a non-significant effect on both traits in the first one.
First parity had a different trend for both DMY and LSCC when compared to the second and third parities, which had similar trends. Curves for LSCC along the trajectory of DIM in the first three parities of Egyptian Buffalo shaped like an inverted milk production curves.
Key words: Somatic Cell Count, Milk Yield, Egyptian Buffalo
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| Publication year |
2004
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| Pages |
61-71
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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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| City |
المنصورة
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| serial title |
12th Scientific Conference, Egyptian Society of Animal Production. Mansoura University, Egypt, November 29, December (3) 2004. Egyptian Journal Animal Production 41 (Supplemental Issue): 61-71.
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| Author(s) from ARC |
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| External authors (outside ARC) |
على عطية نجم
جامعة القاهرة
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| Agris Categories |
Animal physiology - NutritionAnimal physiology - Reproduction
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AGROVOC
TERMS |
Egypt.
Milk yield.
Somatic cell count.
Water buffaloes.
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| Publication Type |
Conference/Workshop
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