University of Khartoum

Effect of Concentrate Supplementation on Reproductive and Productive Performance of the Desert Sheep (Hamari subtype) under Range Condition of Sudan

Effect of Concentrate Supplementation on Reproductive and Productive Performance of the Desert Sheep (Hamari subtype) under Range Condition of Sudan

Show full item record

Title: Effect of Concentrate Supplementation on Reproductive and Productive Performance of the Desert Sheep (Hamari subtype) under Range Condition of Sudan
Author: Aldouma., Omer Mohammed Bushara
Abstract: This work was conducted to study the effects of supplementary feeding of grazing Hamari subtype ewes on reproductive performance and their lamb growth rate, feedlot performance, carcass characteristics and meat quality.The experimental design and statistical analysis used were based on simple randomized design. The study was carried out at Um Jacko village, 20 kilometers East of Elnuhood town, West Kordofan State. Two experiments were conducted. The first experiment was carried out shortly before the breeding period. Ninety ewes similar of age 1-3 years and an average live weight range of 40 to 58 kg were divided randomly into three groups of 30 animals each. Group A was given concentrate supplement for one month before, one month after mating, and one month before lambing; group B was given the supplement for one month before mating and one month before lambing, whereas group C was kept on natural grazing only as a control group. All animals were allowed to graze on natural range consisted mainly of plants as Zorniaglockidata (Shiline), Eragrostis tremula (Banu), Aristida mutablis (Gaw), Cenchrus biflorus (Haskaneet),and Abutilon spp (El Neiada). Animals were watered every 2-3 days. The concentrate diet was offered on group base at a rate of 500 gm./ewe/day, and consisted of sorghum grains 15 %, groundnut cake 20 %, molasses 15 %, wheat bran 25 %, groundnut hullus 23 %, 1 % salt and 1 % limestone. Mature rams were introduced to ewes at the beginning of the breeding period. Reproductive parameters and mortality data were recorded. The second experiment was conducted using weaned lambs that were born to ewes in experiment 1. Thirty two ram lambs of an equal average weight of 25.75 kg and of about 6 month of age were used for a feedlot study. Lambs were randomly divided into four groups A, B, C and D according to their dam's previous feeding program in experiment 1. Each group contained eight lambs. All lambs were allowed to graze on natural pasture during the day, then given concentrate supplement of experiment 1 on ad libitum base for 60 days except group D which was left on grazing only as a control. Lambs watering was every 2-3 days. Carcass characteristics and meat chemical composition and quality were studied on five lambs form each group. The results indicated that concentrate supplementation improved reproductive traits as conception rate in the first service, lambing rate, fecundity, and prolificacy, and reduced abortion and mortality rates. Birth weight in general and that of ram lambs were heavier in concentrate supplemented ewes. Concentrate supplementation of ewes had no significant effect on pre-weaning growth rate of their lambs and ewe average daily milk yield. Feedlot performance of weaned lambs indicated that final live weight, total weight gain and daily weight gain were significantly (p<0.01) different between supplemented groups and the control. Regression coefficients between body weight and period of fattening were high in all lamb groups. The results also indicated that slaughter, hot, cold and half carcass weights and empty body weight were not significantly different among lamb groups that were finished on concentrates, but were significantly (P<0.05) heavier than those of the control group. No significant differences were found in dressing percentage between lamb groups. Only genital organs and fat depots were significantly (P<0.05) heavier in concentrate supplemented lambs than those on the control. No significant differences in whole sales cuts were found between all groups. Carcass composition showed that concentrate supplementation resulted in significant (p<0.001) increase in muscle, fat, and trim percentages than in control. Chemical composition of Longissimus dorsi muscle showed that protein and fat percentages were higher and the reverse was true for moisture in lambs finished on concentrates than in those on the control. Meat quality attributes indicated that cooking loss decreased significantly (p<0.001) while water holding capacity improved significantly (p<0.001) in meat of supplemented groups than the control. Economical appraisal of fattening lambs showed that the high cost of concentrates affected total variable costs but the high sale prices of supplemented fat lambs reflected positively on profit increase. It was concluded that concentrate supplementation of grazing before and during the breeding period enhanced ewe's reproductive attributes and that of grazing lamb's improved their production and increased their sales revenue.Thus it is recommended to adopt concentrate supplementationof ewes before and after mating to enhance their reproductive performance and of their lambs to improve their growth rate and sale revenues.
Description: 155 Pages
URI: http://khartoumspace.uofk.edu/123456789/25198


Files in this item

Files Size Format View

This item appears in the following Collection(s)

Show full item record

Share

Search DSpace


Browse

My Account