University of Khartoum

Body Weight and Growth Rate of Crossbred (F1) Beef Cattle (Red Angus and Simmental x Local Cattle)

Body Weight and Growth Rate of Crossbred (F1) Beef Cattle (Red Angus and Simmental x Local Cattle)

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Title: Body Weight and Growth Rate of Crossbred (F1) Beef Cattle (Red Angus and Simmental x Local Cattle)
Author: Ibrahim, Ibrahim Elrshied Ali
Abstract: A crossbreeding program designed to produce a new synthetic beef breed was initiated by the Federal Ministry of Animal Resources, Fisheries and Rangeland in collaboration with the private sector. The main objective of this study was to determine the factors affecting body weight and weigh gain of crossbred Red Angus and Simmental with local Sudanese cattle raised under Sudan conditions. The study was conducted at a farm in Alkadarow area. Four hundred cows were purchased from local markets of different states. The cows were randomly split into two groups and were artificially inseminated with Simmental and Red Angus imported semen using artificial insemination. The calves produced were immediately weighed after birth and monthly thereafter. Data on the birth weight, body weight during 6th month and growth rate during 12th month were classified according to sex of calf, season and year of birth, sire breed, dam ecotype and dam weight. The birth weight was 25.56kg. Sire breed, dam ecotype, season of birth and sex of calf had no significant (P>0.05) influence on the birth weight, while it was significantly (P≤0.001) affected by year of birth and dam weight. The average body weight at 3rd month, 6th month, 9th month and 12th month were 80.08, 153.32, 228.47 and 281.15 kg, respectively. The weight gain from birth to 3rd month, 3rd to 6th month, 6th to 9th month and 9th to 12th month were 0.60, 0.82, 0.85 and 0.72 kg, respectively. However, the overall average daily weight gain from birth to 12th month was 0.69 kg. Sex of calf had a significant influence on the weight gain from the 6th to the 12th month of age and had a significant effect on overall weight gain from birth to yearling age. The male calves gained more weight than females. Sex significantly influenced weight at one year, and male calves (307.33kg) recorded higher body weights than females (255.74kg). Sire breed had no significant effect on body weight and weight gain. There was a significant effect of dam ecotype on daily weight gain between the third and sixth month of age and had no significant effect on either body weight or weight gain other wise. Year of birth had significant (P≤0.001) influence on the body weight and weight gain in the period between the third and sixth month of age. The season of birth had significant (P≤0.001) influence on daily weight in the same period. It also significantly affected body weight at 3rd, 6th and 9th. Calves obtained in the dry summer had highest weights, followed by wet summer calves and then winter calves. The study concluded that birth weight of crossbred calves, from the two exotic beef breeds with local cattle of Sudan, is moderate and results in easy calving with no cases of dystocia reported. The sire and dam ecotype have no major effect on weight and growth rate of crossbred calves up to one year of age which means that any of the studied dam ecotypes may be used in the production of the new breed, and that the two sire breeds produce more or less similar yearling calves. The use of these two exotic breeds in a crossing program designed to produce a new synthetic beef breed, requires more studies to evaluate growth performance at later ages, meat and carcass attributes, reproductive performance of crossbred females, and estimate of the feed conversion efficiency of the crossbreds. The economic feasibility of the program also needs to be investigated
URI: http://khartoumspace.uofk.edu/123456789/16952
Date: 2015-11-11


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