Effect of fattening and age at slaughter on Tagger goat performance and carcass characteristics in the Gezira State, Sudan

Mohamed E. Elimam, Yassir i A. Ombab, Samia Ahmed, Hammed A.M. Ageeb

Abstract


Tagger goat males born in the Goat Research Centre, University of Gezira, Sudan were fattened at 6 or 12 months of age on groundnut haulm ad lib (5% body weight) and 300g concentrates/day for 6 weeks. Weekly weight gain generally increased with age and was highest in the fifth week. The increase in weight was higher in the young group. Tagger goat meat was light red and fat was white. Body components increased with slaughter age. The percentages of body components weight on empty body weight (EBW) were higher in the older group for head, skin, lungs, spleen, intestines, mesenteric and omental fat and testicles, but not significant and were higher in the young group for blood, legs, heart, liver, kidneys, renal fats, alimentary tract full and empty, rumen and total fats. Age at slaughter significantly (P≤ 0.05) affected percentages of legs, forelegs, hind legs, liver, kidneys and alimentary tract full. Slaughter weight, EBW, hot carcass weight (HCW) and dressing percentages (LBW and EBW), carcass muscles were higher in the old group.  Bones and fat were higher in the young group. Age had significant effects on bones but not fat (P≤ 0.05). Muscle to bone and muscle to fat ratios were higher in the old group, however, the differences were only significant for the former. Whole sale cuts were heavier in the old group and differences in weight were significant (P≤ 0.05) for neck, single short forequarter and loin. They were the heaviest for single short forequarter followed by leg and chump and least for the loin. The percentages of the cuts were higher in the old group for neck, single short forequarter and leg and chump. Muscles, bones and fat were

 

higher in the old group for single short forequarter, loin, leg and chump. Neck muscles and bone were higher in the old group. Best end of neck and breast muscles were higher in the old animals. Muscles weight was significantly higher in goats fattened at 12 months, except for leg and chump. Bones and fat weight were not significantly different in all cuts. Moisture had a positive correlation with ash and negative correlation with fat and protein, and the correlations were only significant (P<0.01) for the latter. Protein had a positive correlation with fat and a negative correlation with ash. Fat had a positive correlation with ash.


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