Morteza karami; Mohsen Bagheri
Volume 22, Issue 4 , December 2020, , Pages 689-695
Abstract
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 ...
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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.
Abdollah Rezagholivand Lahrud; Akbar Nikkhah; Hadi Khabazan; Saeed mokhtarzadeh; Majid Dehghan; Farzad Sadighi; Yosef Mokhtabad; Farzad Safari; Azim Rajaei
Volume 22, Issue 3 , September 2020, , Pages 457-469
Abstract
The aim of this study was to compare feedlot performance, carcass characteristics, blood metabolites, and economic profits between pure and crossbreeds Holstein calves. Crossbreeds were produced by crossing Holstein (H) cows with Angus (A), Charolais (C), Limousin (L) and INRA 95 (I) bull’s semen. ...
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The aim of this study was to compare feedlot performance, carcass characteristics, blood metabolites, and economic profits between pure and crossbreeds Holstein calves. Crossbreeds were produced by crossing Holstein (H) cows with Angus (A), Charolais (C), Limousin (L) and INRA 95 (I) bull’s semen. The performance of 25 calves of each breed (125 calves in total) was compared in a fattening period of eleven months. The average daily gain was significantly higher in crossbred calves compared to pure Holstein calves. The interaction of breed and time was significant (p < 0.01). The Charolais crossbred calves and pure Holstein had significantly lower dry matter intake than other crossbreeds, and feed conversion ratio in the C×H calves was remarkably more favorable than other groups (p < 0.01). Dressing percentage and saleable meat yield for C×H, L×H and I×H crossbreeds were higher than for pure Holstein and A×H. Concentrations of plasma urea of Charolais crossbred calves was more than other groups (p < 0.01). Economic calculations demonstrated that the respective highest profit for the whole fattening period belonged to crossbreeds of C×H, I×H, L×H, A×H, and pure Holsteins. In conclusion, the calves from Holstein-beef crosses had higher feedlot performance, dressing percentage and economic productivity than pure Holstein calves.