بررسی اثر طول مدت پرواز بر صفات رشد، لاشه و بازده اقتصادی بره های نر نژاد شال

نویسندگان

1 گروه علوم دامی مجتمع آموزشی ( پردیس) ابوریحان دانشگاه تهران

2 گروه علوم دامی دانشکده کشاورزی و منابع طبیعی کرج دانشگاه تهران

چکیده

Twenty four male lambs divided into four groups and were
allocated to 90, 105, 120 and 135 days of fattening periods.
At the end of each fattening period, lambs were
slaughtered. The percentage of cold carcass on the basis of
empty body weight in the mentioned periods were 57.0 ±
0.94, 57.5 ±1.7, 59.9 ±3.3 and 62.2 ±4.4,
respectively(p<0.05). Moreover, the average of
subcutaneous and intramuscular fat percentages were 11.2
±1.6, 13.4 ±3.2, 15.2 ±2.4 and 16.0 ±2.4,
respectively(p<0.05). Average percentages of crude
protein, ether extract, ash and moisture showed significant
difference among experimental groups (p<0.01).
Moreover, ratio of weight percentage for large and small
intestine, blood, abdominal and kidney fat to empty body
weight showed significant difference among
groups.(p<0.01). Results show that net profit per kilogram
live weight gain increases in longer fattening period.
Increasing of fattening period cause carcass quality to be
reduced. So, the reduction of feed efficiency and carcass
quality is not in favor of the national benefits.

کلیدواژه‌ها

عنوان مقاله [English]

EFFECT OF FATTENING PERIOD ON GROWTH,CARCASS CHARACTERISTICS AND ECONOMIC EFFICIENCY OF CHAALBREED MALE LAMBS

نویسندگان [English]

  • Naser Emam jomeh 1
  • Majid Khaldari 2
  • Ahmad Khaldari 1
چکیده [English]

Twenty four male lambs divided into four groups and were allocated to 90, 105, 120 and 135 days of fattening periods.At the end of each fattening period, lambs were slaughtered. The percentage of cold carcass on the basis of empty body weight in the mentioned periods were 57.0 ± 0.94, 57.5 ±1.7, 59.9 ±3.3 and 62.2 ±4.4,respectively(p<0.05). Moreover, the average of subcutaneous and intramuscular fat percentages were 11.2 ±1.6, 13.4 ±3.2, 15.2 ±2.4 and 16.0 ±2.4,
respectively(p<0.05). Average percentages of crude protein, ether extract, ash and moisture showed significant difference among experimental groups (p<0.01).Moreover, ratio of weight percentage for large and small intestine, blood, abdominal and kidney fat to empty body weight showed significant difference among groups.(p<0.01). Results show that net profit per kilogram live weight gain increases in longer fattening period.Increasing of fattening period cause carcass quality to be reduced. So, the reduction of feed efficiency and carcass quality is not in favor of the national benefits.

کلیدواژه‌ها [English]

  • carcass fat
  • Chaal breed
  • efficacy
  • Fattening period
مجله تحقیقات دامپزشکی (Journal of Veterinary Research)
دوره 62، شماره 1
فروردین 1386
صفحه 33-38

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