Effect of two different sources of zinc supplementation on productive performance of Friesian dairy cows
Abstract: This study was conducted to investigate the effect of zinc sulfate and zinc methionine supplementation on the digestion coefficients, nutritive value, ruminal and some blood parameters, milk yield and milk composition of Friesian dairy cows. Animals were fed according to the NRC feed allowances for dairy cattle (1989). Fifteen Friesian dairy cows were divided into three groups (five animal each). Animal were fed on the following rations: Control group fed concentrate feed mixture (CFM), berseem (Trifolium alexandrinum) hay and rice straw without zinc supplementation. The 1st tested group was fed control ration + 40mg zinc sulfate /kg dry matter intake (DMI) and the 2nd tested group was fed control ration +40mg zinc methionine /kg DMI. All groups were fed for a period from the expected calving date to 182 days of their lactation season. Results indicated that the addition of zinc improved the nutrient digestibilities and feeding values as TDN and DCP. Also, zinc supplements tended to reduce ammonia-N and somatic cell counts but increased TVFA's, improved feed efficiency and milk yield. Moreover, zinc supplementation improved serum total protein and globulin, but reduced the concentration of both albumin and urea in blood serum.
Keywords: Friesian cows, zinc methionine, feed intake, digestibility, ruminal and blood parameters, milk yield, somatic cell counts
Publication year 2010
Pages 11-22
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
serial title Egyptian Journal of Animal Production
ISSN 0302-4520
Author(s) from ARC
Agris Categories Animal feeding
AGROVOC
TERMS		 Digestibility. Feed intake. Milk yield.
Proposed Agrovoc somatic cell counts;blood parameters;ruminal;Friesian cows;zinc methionine;
Publication Type Journal
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