Effect of Increasing Degradable Nitrogen from Adding Urea to the Ration of Awassi Ewes in Milk Yield and some Components

TLDR: In this article, the effect of increasing degradable nitrogen from adding urea to the food of Awassi ewes milk yield and components was investigated and the results indicated a significant increase (p≤0.05) in weekly, monthly and commercial yield for the treatment of high degradability protein.

Abstract: This experiment conducted at 1/12/2017 to 4/3/2018 by using 30 ewes with their lambs. The weights of the ewes between (46-51) Kg and the ages between (3-5) years, to study the effect of increasing degradable Nitrogen from adding urea to the food of Awassi ewes milk yield and components. The experiment done by three levels of Nitrogen degradable (low, 0% urea) (mid, 0.75% urea), (high, 1.5 urea). and by three treatments each of them consists of 10 ewes. The results indicated a significant increase (p≤0.05) in weekly, monthly and commercial yield for the treatment of high degradable protein. For the milk components during sucking and after weaning (fat, protein, lactos, S.N.F) the results revealed non significant differences. The adding of urea to the ration of awassi ewes in creased milk production. Keyword: Fat, Protein, Lactos Received: 9/21/ 2018, Accepted: 12/2/1129 INTRODUCTION The production of milk was one of the important characteristics for lambs growth and for human needs for taking large quantities of milk. So the sheep breeders worked hard to increase the milk production (Al-Saegh and Al-Kass, 1992). The best way to increase the protein rate in the food by adding different Oil Seed meal, but they were very expensive and their quantities were very little, also they were imported. Accordingly the scientists made many experiments to provide the needs of ruminants of protein frome cheap and non protein nitrogen source, So they depended on ability of organisms in rumen of animal to make a pactirial protein specialy from urea because it was available and very cheap and it was rich in nitrogen 46% and contained protein equiv 292% (Al-Hafz, 1992). The Awassi sheep group was one of the most important kinds in lands semiarid lands of the middle east countries, and they have a good meat and milk, they can live with different environmental systems and they're resistant to diseases and dare the high temperatures, for that, they encouraged the sheep breeders on their breeding (Lafi, etal., 2009) and (FAO, 2006). The aim of this experiment is to study the effect of increasing degradable nitrogen from adding urea to the food of awassi ewes in milk yield and some components. The research is part of MS.C thesis. نــيدـفارــلا ةـــعارز ةـــلـجـم ( دلجملا 47 ( ددعلا ) 1 ) 2019 ISSN: 2224 9796 (Online) ISSN: 1815 316 X (Print) Mesopotamia J. of Agric. Vol. (47) No. (1) 2019 37 MATERIALS AND METHODS This study was done in afield of one breeder in Tal – yara village which affiliated to Baasheka from 1/12/2017 to 14/3/2018. 30 Awassi ewes were used in this study, they were divided into three treatments, and the table (1) show percentage of components of the bush and chemical analysis Table (1) Ingredients and chemical composition of diets Treatments Item Treat. (1) 0% urea (Low D.) Treat. (2) 0.75% urea (Mid D.) Treat. (3) 1.5% urea (High D.) Barly 65% 65% 65% Wheat bran 32.25% 31.5% 30.75% Urea 0% 0.75% 1.5% Food salt (NaCl) 0.75% 0.75% 0.75% Calcium blocks (CaCo3) 1% 1% 1% Bentonite 1% 1% 1% Chemical Composition CP% 11.59 13.60 15.60 DM% 91.20 91.43 91.58 OM% 95.17 95.33 95.41 CE% 17.23 17.19 17.15 EE% 2.39 2.51 2.43 Ash% 4.36 4.42 4.33 RDP% 9.14 11.15 13.18 RUP% 2.45 2.44 2.10 D.P energy gm D.P/ M.J 8.76 10.76 12.80 * Means with different subscripts vertically differ (p≤0.05). Percent calculated for DM, OM, CP, EE and Ash laboratory as (AOAC, 2000) and it was calculated NE and D.P. energy depend on DM (AL-Khawaja, etal., 1987). Estimated the proportions of milk components by (milkana) machine. Data were analyzed by using (C.R.D) according to what was stated in (Al-Rawi and Khallafallah, 1980), and used the mathematical model Yij = μ + ti + eij Yij = Samples. μ = Samples means. ti = The effect of treatment and it means the effect of urea. eij = The random trial error value. And using the test of Duncan (Duncan, 1955), and using the analysis program (SAS, 2003). نــيدـفارــلا ةـــعارز ةـــلـجـم ( دلجملا 47 ( ددعلا ) 1 ) 2019 ISSN: 2224 9796 (Online) ISSN: 1815 316 X (Print) Mesopotamia J. of Agric. Vol. (47) No. (1) 2019 38 RESULTS AND DISCUSSION 1. Milk production: The results indicated a significant increase (p≤0.05) in daily and weekly milk production since the fourth week till the end of experiment for the behalf of high degradable protein which compared with the behalf of mid degradable protein and the behalf of low degradable protein, as seen in table (2). Table (2) The effect of increasing degradable Nitrogen in weekly milk production (gm)