Effect of different levels of supplemented organic zinc source on performance of Friesian dairy cows
Abstract: This study was conducted to investigate the effect of different levels (40mg , 80mg and 120mg /kg DMI ) of zinc methionine supplementation on the digestion coefficients, nutritive value, ruminal and some blood parameters and birth weight of their offspring, milk yield and milk composition of the experimental Friesian dairy cows were also investigate. Animals were fed according to the NRC feed allowances for dairy cattle (1988). Twenty pregnant Friesian dairy cows at the last three months of pregnancy were divided into four similar groups ( five animal each) fed in the following rations 1- The control group was fed concentrate feed mixture (CFM) + berseem hay + rice straw) without zinc methionine supplementation. 2- The 1st tested group fed control ration + 40mg zinc methionine /kg dry matter intake (OMI) .3- The 2nd tested group fed control ration + 80mg zinc methionine /kgDMI 4- The 3ra tested group fed control ration + 120mg zinc methionine /kgOMI . All groups were fed from about three months before the expected calving date and continued up to the first 210 days of their lactation season. Results indicated that the addition of different levels of zinc methionine had improved the digestibilities of DM,OM,CP ,CF, feeding values as TDN and DCP, feed efficiency and thus increased milk yield compared with the control group. Birth weight of calves was increased with 40mg zinc methionine level compared with the other levels and the control group .Moreover, zinc supplementation improved serum total protein and globulin, but it reduced the concentration of both albumin and urea in blood serum.
Keywords: Friesian dairy cows - zinc methionine - feed intake -digestibility -ruminal and blood parameters.-calves birth weight - cows milk yield and composition -somatic cell counts.
Publication year 2005
Pages 3025-3035
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
City المنصورة
serial title Journal Agricultural Science Mansoura University
ISSN 1110-0346
Author(s) from ARC
Agris Categories Animal feeding
AGROVOC
TERMS		 Dairy cows. Digestibility. Feed intake. Performance testing.
Proposed Agrovoc organic zinc source;zinc methionine;ruminal and blood parameters;calves birth weight;cows milk yield;somatic cell counts;
Publication Type Journal
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