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.
A. Hasanzadeh seyedi; A. Hosseinkhani; M. Moradi
Volume 14, Issue 2 , January 2012, , Pages 31-41
Abstract
The chemical composition and digestibility characteristics of bread waste were determined and the effect of it on feedlot performance studied on 100 Sarabi steers. Dry matter, organic matter, ether extract, crude protein and NDF digestibility of bread waste were 87.2, 84.5, 76.7, 62.2 and 82.9 percent, ...
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The chemical composition and digestibility characteristics of bread waste were determined and the effect of it on feedlot performance studied on 100 Sarabi steers. Dry matter, organic matter, ether extract, crude protein and NDF digestibility of bread waste were 87.2, 84.5, 76.7, 62.2 and 82.9 percent, respectively. Degradability parameters of bread waste including a, b and c compartments were 19.5 and 74.6 percent and 0.5 percent/hour, respectively. Metabolizable energy (ME), organic matter digestibility (OMD) and short chain fatty acid (SCFA) amount calculated using gas production technique and were 9.7 MJ/kg, 51.3 percent and 1.18 ml/200 mg DM of bread waste respectively. The difference of feed conversion ratio and dressing percentage of carcass of the steers were significant (P< 0.01). The ration containing 30 percent of bread waste had the best feed conversion ratio (P< 0.01).