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Effect of feeding diets supplemented with zinc, copper and selenium pre or postpartum on milk yield and somatic cell count of Friesian cows
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Abstract: The objective of this study was to evaluate the effects of adding Zn, Cu and Sein the ration of dairy cows on milk yield, somatic cell count (SCC) and blood parameters. A total of 39 Friesian cows between the 1st and 3rd parity and average live body weight (LBW) of 532.7±23.5 kg were divided into three similar groups (n=13 each) Mutiparous cows (n=10 in each group) were divided according to their BW, parity and milk production of the previous season, while primiparous cows (n=3 in each group) were allotted based only on their BW. Cows of the 1st group (G1) were fed concentrate feed mixture (CFM), rice straw and corn silage (control). Cows of the 2nd group (G2) received 60 mg Zn, 20 mg Cu and 0.3 mg Se /kg diet at 30 day pre-partum to calving, while those of the 3rd group (G3) received the same dose of (G2) but from day one to 60 days of postpartum in the ration. Throughout the experimental period. cows were machine milked and daily milk yield was individually recorded for the 1st four months. Milk composition, blood samples and lymphocytes, monocytes and granulocytes (immune response) were determined Milk samples for SCC determination were collected biweekly from 10 days after lactation until 90 days of lactation. Results revealed that Zn, Cu and Se diet improved (P<0.05) daily milk production ofG2 and G3 by 22. 7 and 12.0%, respectively compared with GI.G3 had higher (P<0.05) percentages of fat, protein and lactose as compared to G1. G2 had higher (P<0.05) percentages of fat and lactose compared to G1, while protein percentage was similar to G 1. Diet supplemented with Zn, Cu and Se (G2 and G3) showed lower (P<0. 05) somatic cell count in milk as compared to G1. Increase SCC lead to decrease milk yield. fat, protein and lactose percentages. Cows of treatments G2 and G3 were higher in red blood cell (RBC) and white blood cell (WBC) counts, hemoglobin (Hb) concentration and haematocrit percentage (HCT,%) than those of the control group. Cows treatment were higher significantly lymphocytes and significantly lower moncytes than control group. All protein fraction and Se concentrations were higher in G3 and G2 than in control group (GI), however, significantly higher in G3 than in G2. But, plasma Zn and Cu concentration were higher significantly (P<0.05) in G2 and G3 than the control group (GI).
Keywords: Friesian, lactation, somatic cell count, milk yield and trace minerals.
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| Publication year |
2011
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| Pages |
85-94
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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 of Animal Production
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Copper.
Cows.
Milk yield.
Perinatal period.
Selenium.
Somatic cell count.
Zinc.
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| Publication Type |
Journal
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