EFFECT OF SLAUGHTER WEIGHT ON MEAT PRODUCTION POTENTIAL OF WESTERN SUDAN BAGGARA CATTLE
EFFECT OF SLAUGHTER WEIGHT ON MEAT PRODUCTION POTENTIAL OF WESTERN SUDAN BAGGARA CATTLE
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Date
2015-04-09
Authors
MAGZOUB, ABDELRAHMAN
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Abstract
The study was conducted to examine the effect of target
slaughter weight on feedlot performance, carcass and meat quality and
the economic of meat production. Forty-eight western Baggara bulls
were divided into four groups of similar body weight (164.55+3.9 kg)
and all groups were intensively fed molasses based diet. The groups
were randomly assigned to four target slaughter weights 200, 250, 300
and 350kg. A set of 8 external body measurements was recorded on each
animal. Data on feed intake and live weight growth were collected on
daily and weekly basis respectively. Bulls were sacrificed after they
attained their predetermined slaughter weights.
Slaughter and carcass data were collected. The quality attributes
of the meat from the four groups were also carried out. Analysis of
variances was used to study the effect of target weight on feedlot
parameters, carcass composition and meat quality. The value of the
different external body measurements in predicting live weight was
carried out using correlation and regression analysis. The allometric
equation in the logarithm form was used to describe relative growth of
body components.
The bulls on the 200, 250, 300 and 350 target slaughter weight
groups took 36.1, 91.58, 152.52 and 220.5 days to reach the target
weight, respectively. The results indicated that the daily gain declined
significantly (P<0.05) as the live weight increased. That was
accompanied by a significant deterioration (P<0.01) in feed conversion
ratio. The daily dry mater feed intake proportion declined (P <0.001) as
the body weight increased.
Economically the gross margin and the coefficient of private
profitability declined as period on feed and live weight increased. The
lighter bulls revealed the highest profitability while bulls slaughtered at
350 kg consumed higher level of inputs and profit turned in a negative
value.
Heart girth showed the highest correlation coefficient (r =0.93)
while body length scored the lowest (r = 0.65).
The proportions of noncarcass components from empty body
weight declined significantly (P<0.001) as body weight increased with
exception of omental and mesenteric fat, which increased with the
increase of live weight. Omental and mesenteric fat grew at a higher rate
than the whole body. Excluding the omental and mesenteric fat, all other
noncarcass components grew at a lower rate than the empty body weight
(b <1).
Carcass parameters such as rib eye muscle area, carcass length,
leg circumference, abdominal and chest circumference, and
subcutaneous fat thickness increased (P<0.001) with body weight
increase. These parameters were also found to regress significantly
(P<0.001) and positively with carcass weight. However, leg
circumference had the highest correlation (R = 0.92) and abdominal
depth the lowest (R = 0.66) correlation with the carcass weight. The
dressingpercentage increased (P<0.001) with the increase of slaughter
weight till 300 kg live weight and thereafter the increase was not
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EFFECT OF SLAUGHTER WEIGHT ON MEAT PRODUCTION POTENTIAL OF WESTERN SUDAN BAGGARA CATTLE