نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار،بخش علوم دامی ، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، شهرکرد، ایران.

2 مربی،بخش علوم دامی ، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان چهارمحال و بختیاری، شهرکرد، ایران.

چکیده

هدف از این آزمایش بررسی مقایسه ای عملکرد پروار و خصوصیات کمی لاشه بره های لری بختیاری و آمیخته های رومانفΧلری بختیاری بود. به همین منظور از 44 راس بره لری بختیاری 100 روزه  و 44 راس بره آمیخته رومانف با لری بختیاری 100 روزه در قالب طرح کاملا تصادفی به روش فاکتوریل 2Χ2Χ2 با دو گروه ژنتیکی(لری بختیاری و آمیخته رومانفΧلری بختیاری)جنس (نر و ماده) و سال (1395 و 1396) استفاده شد. افزایش وزن روزانه، جیره های مورد مصرف،، ضریب تبدیل خوراک و نیز ویژگی های کمی لاشه دام ها اندازه گیری شد. نتایج نشان داد که میانگین افزایش وزن روزانه قبل از شیرگیری و نیز وزن در سن 100 روزگی (پایان شیرگیری) در بره های آمیخته رومانفΧلری بختیاری بیشتر از بره های لری بختیاری بود(p <0/05). اما میانگین افزایش وزن روزانه طی دوره پروار، وزن دوره پروار، مصرف خوراک، وزن لاشه و درصد دنبه بره های لری بختیاری بیشتر از آمیخته های رومانفΧلری بختیاری بود(p <0/05). بره های نر ، میانگین افزایش وزن روزانه دوره پروار بیشتر و ضریب تبدیل کمتری نسبت به بره های ماده داشتند(p <0/05). درصد دنبه و چربی لاشه بره های نربیشتز از ماده ها بود(p <0/05). نتایج این مطالعه نشان داد که عملکرد قبل از شیرگیری بره های آمیخته از بره های لری بختیاری بهتر ولی عملکرد دوره پروار آن ها کمتر است. لذا به نظر می رسد پروار بره های لری بختیاری مناسب تر از آمیخته ها در استان چهارمحال و بختیاری باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of feedlot performance and carcass characteristics of Lori-Bakhtiari and Romanov×Lori-Bakhtiari crossbreed lambs

نویسندگان [English]

  • Morteza karami 1
  • Mohsen Bagheri 2

1 Head of Animal science department,, AREEO, Ch&amp;amp;B province

2 Department of Animal Science ,AREEO, Ch &amp; B, Province

چکیده [English]

The aim of this experiment was to compare the feedlot performance and carcass characteristics of Lori-Bakhtiari and Romanov×Lori-Bakhtiari crossbreed lambs. Forty-four Lori-Bakhtiari lamb and Forty-four Romanov×Lori-Bakhtiari lambs were used in a completely randomized design and using a factorial method (2×2) during two consecutive years. The average daily gain and daily feed intake were determined by individual weaning of each animal and then feed conversion ratio was calculated. Carcass characteristics of lambs were measured. The results showed that average daily gain during fattening period (212.1vs. 179.6 g), final fattening weight (52.12 vs. 48.26 kg), feed intake, carcass weight and fat tail percentage in Lori Bakhtiari lambs were greater than Romanov× Lori Bakhtiari crossbred lambs. The average daily gain before weaning (298.4 vs. 266.8 g), the average daily gain during fattening period (217.2 vs. 161.9 g), and feed conversion ratio (7.62 vs. 9.75) in male lambs was better than female lambs (p < 0.05). Fat tail percentage and total carcass fat content in male lambs were higher than that of female lambs (p < 0.05). It is concluded that, Romanov×Lori Bakhtiari crossbred lambs had higher performance than Lori Bakhtiari lambs before weaning. However, fattening period performance and carcass weight in Bakhtiari lambs were higher compared to Romanov×Lori Bakhtiari crossbred lambs. In addition, energy spent per kg of carcass and live weights in Bakhtiari lambs was lower than Romanov×Lori Bakhtiari crossbreds. Therefore, it can be concluded that the indigenous Bakhtiari sheep breed is more useful for fattening than that of Romanov×Lori Bakhtiari crossbreds in Chaharmahal and Bakhtiari province.

کلیدواژه‌ها [English]

  • carcass characteristics
  • Feedlot
  • genotype
  • Sex
  • Sheep Growth performance
1. Abdullah YA, Kridli RT, Momani Shaker M
and Obeidat MD (2010). Investigation of
growth and carcass characteristics of pure and
crossbred Awassi lambs. Small Ruminant
Research, 94: 167-175.
2. Afshari KP, Abbasi MA, Aminafshar M,
Vatankhah M and Chamani M (2012). Economic
analysis of intensive sheep production system in
Iran by bioeconomic model. Research opinions in
Animal and Veterinary Science, 2(2): 127-132.
3. Boujenane I. (2015). Growth at fattening and
carcass characteristics of D’man, Sardi and
meat-sire crossbred lambs slaughtered at two
stages of maturity. Tropical Animal Health and
Production, 47(7): 1363-1371.
4. Cloete JJE, Cloete SWP, Olivier JJ and
Hoffman LC (2007). Terminal crossbreeding
of Dorper ewes to Ile de France, Merino Land
sheep and SA Mutton Merino sires: Ewe
production and lamb performance. Small
Ruminant Research, 69: 28-35.
5. Dickerson GE (1970). Efficiency of animal
production molding the biological components.
Journal of Animal Science, 30: 849-854.
6. Emam Jomeh Kashan N (1993). Investigation of
fattening and carcass characteristics of Shal and
Zandi lambs and their crossbreeding. Iranian
Agriculture Science, 16(2): 47-63. (In Persian).
7. Farid A (1989). Direct, maternal and heterosis
effects for slaughter and carcass characteristics
in three breeds of fat-tailed sheep. Livestock
Production Science, 23: 137-162.
8. Gholami H and Kianzad MR (2015).
Investigation of growth, carcass characteristics
and economic efficiency of Zel breed and their
crossbred. Journal of Animal Production, 16
(2): 137-145. (In Persian).
9. Güney O (1990). Commercial crossbreeding
between Ile-de-France, Rambouillet, Chios and
local fat-tail Awassi for market lamb production.
Small Ruminant Research, 3: 449-456.
10. Karami M (2019). Effect of diets with
different levels of metabolizable energy on
physical and chemical carcass characteristic
of male kids. Research on Animal Production,
22: 83-91. (In Persian).
11. Kridli RT, Abdullah YA, Momani Shaker M and
Al-Momani AQ (2006). Age at puberty and some
biological parameters of Awassi and its first
crosses with Charollais and Romanov rams.
Italian Journal of Animal Science, 5: 193-202.
12. Lakzaei H, Ghanbari F, Bayat Kouhsar J and
Gharehbash AM (2020). Blood parameters and
fattening performance comparison of Zel and
Dallagh male lambs breeds and their crossbred
with Romanov breed in different thermalhumidity
conditions. Journal of Animal
Production, 22(1): 173-185. (In Persian).
13. Lakew M, Haile‐Melekot and Mekuriaw G
(2014). Evaluation of growth performance of
local and Dorper × local crossbred sheep in
eastern Amhara region, Ethiopia. Iranian Journal
of Applied Animal Science, 4(4): 787-794.
14. Makarechian M, Farid A and Sefidbakht N
(1977). Lamb growth performance of Iranian
fat-tailed Karakul, Mehraban and Naeini
breeds of sheep and their crosses with
Corriedale and Targhee rams. Animal
Production, 25: 331-341.
15. Miraei-Ashtiani SR, Noshary AR. and Moradi
Shahrbabak M (2003). Evaluation of the lamb
and feedlot performances of three crossbred
and one purebred genotypes of Iranian fattailed
sheep. In: Proceedings of the British
Society of Animal Science. p. 146.
16. Momani Shaker M, Kridli RT, Abdullah YA,
Malinova M, Sanogo S, Sada I and Lukesova
D (2010). Effect of crossbreeding European
sheep breed with Awassi sheep on growth
efficiency of lambs in Jordan. Agricultura
Tropica Et Subtropica, 43(2): 127-133.
17. Nawaz M, Khan MA, Qureshi MA and Rasool
E (1999). Productive and reproductive
performance of Kajli and Lohi ewes. Asian-
Australasian Journal of Animal Sciences,
12(1): 61-67.
18. NRC (2007). Nutrient requirement of domestic
animals. Nutrient requirements of sheep and
goats. National academy of science, Natural
Research Council, Washington, DC.
19. Petrović MP, Sretenović L, Ruzić Muslić D,
Pacinovski N and Maksimović N (2011). The
effect of crossbreeding systems on lamb meat
production. Macedonian Journal of Animal
Science, 1(1): 57-60.
20. Rasali DP, Shrestha JNB and Crow GH (2006).
Development of composite sheep breeds in the
world: A review. Canadian Journal of Animal
Science, 86: 1-24.
21. Shrestha JNB, Boylan WJ and Rempel WE
(2008). Evaluation of sheep genetic resources in
North America: Ewe productivity of purebred,
crossbred and synthetic populations. Canadian
Journal of Animal Science, 88: 399-408.
22. Suarez VH, Busetti MR, Garriz CA, Gallinger
MM and Babinec FJ (2000). Pre-weaning
growth, carcass traits and sensory evaluation of
Corriedale, Corriedale×Pampinta and Pampinta
lambs. Small Ruminant Research, 36: 85-89.
23. Talebi MA and Bagheri M (2020). Comparison
of growth and carcass traits of Lori-Bakhtiari
lambs and their crosses with Romanov and
Pakistani breeds. Iranian Journal of Animal
Science, 50 (4): 283-294. (In Persian).
24. Veress L (1982). Improvement crossbreeding
of Hungarian Merinos for increased prolificacy
and milk yield. EAAP Annual Meeting,
Leningrad.