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Seasonal effect on nitrogen metabolism and its reflection on maintenance protein requirements for Egyptian Oasis sheep
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Abstract: The effect of season on nitrogen metabolism and protein requirements for maintenance of Egyptian Oasis sheep was determined through two nitrogen balance trial in 4 x 4 Latin square design. The first one was carried out in summer while the second one was carried out in winter. In each trial four Egyptian Frafra rams were used. In the two seasons the same rams were used and fed isocaloric ration (72 TDN) covered the maintenance energy requirement but different in its crude protein (CP) content, being 6.13, 7.93, 9.70 and 15.07 % for rations RI, R2, R3 and R4, respectively.
Ambient temperature (AT) and relative humidity (RH%) were recorded simultaneously daily to calculate Temperature humidity index value (THI). Plasma total protein (TP), Albumin (ALB), Urea (UR), cereatinine (CR) and Plasma globulin (GLB) were determined. Nitrogen balance was calculated by difference between nitrogen intake and nitrogen outgo in feces and urine. Nitrogen requirement for maintenance was calculated applying statistical and factorial methods.
Crude protein and ether extract digestibilities were significantly higher in winter than in summer season, while increasing dietary protein significantly improved the digestibility of CP and CF. Nitrogen balance was significantly higher in summer than in winter.
Total water intake was significantly higher in summer than in winter season, also increasing dietary protein level increased total water intake. Insensible water loss (water balance) was not affected by dietary protein level, while it was significantly higher in summer than in winter. Season and level of dietary protein as well as their interaction had insignificant effect on blood nitrogen metabolites.
The present study showed that the protein requirement for maintenance of Egyptian Oasis sheep was higher during winter than in summer by 31.0 %, The values were 3.83 g CP/ kgW0.75 during winter season and 2.57 g CP/ kgw0.75 during summer season.
Keywords: nitrogen metabolism, protein requirements, Egyptian oasis sheep
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| Publication year |
2009
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| Pages |
271-281
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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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| serial title |
Egyptian Journal Nutrition and Feeds
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| ISSN |
1110-6360
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Nitrogen metabolism.
Nutritional requirements.
Proteins.
Sheep.
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| Proposed Agrovoc |
Seasonal effect;maintenance protein;Egyptian oasis sheep;
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| Publication Type |
Journal
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