Performance, carcass quality and blood metabolites of Holstein bulls on feedlot feeding of different proportions of barley grain to maize grain

• Autorzy: Fatehi F. , Dehghan-banadaky M. , Reza-yazdi K. , Moradi-shahrbabak M. , Anele U. Y.
• Języki publikacji: EN

Abstrakty

EN

This experiment was conducted to study the effects of five different ratios of barley grain to maize grain: 1) 100:00, 2) 75:25, 3) 50:50, 4) 25:75, and 5) 00:100 on feedlot performance, carcass quality, ruminal and blood parameters of twenty-five Holstein bulls. Quadratic effects were detected for carcass efficiency and were greatest for diets with barley grain-to-maize grain ratios of 75:25 and 50:50 compared with other diets. Also, back-fat thickness, abdominal fat, and meat ether extract increased as the proportion of maize increased in the diets (P < 0.05). When the proportion of maize in diets increased, the amount of undigested grain in feces increased linearly (P < 0.05). At 3 and 6 h after feeding, as the proportion of barley increased in the diets, ruminal pH decreased quadratically. We conclude that feeding bulls diets based on 50:50 and 75:25 barley-to-maize grain ratios resulted in higher carcass efficiency and optimal ruminal parameters.

• Wydawca: -
• Czasopismo: Journal of Animal and Feed Sciences
• Rocznik: 2013
• Tom: 22
• Numer: 1
• Opis fizyczny: p.35-43,ref.

Twórcy

autor

Fatehi F.

• Department of Animal Science, Campus of Agriculture and Natural Resources, University of Tehran, PC 31587-77871 Karaj, Iran

autor

Dehghan-banadaky M.

• Department of Animal Science, Campus of Agriculture and Natural Resources, University of Tehran, PC 31587-77871 Karaj, Iran

autor

Reza-yazdi K.

• Department of Animal Science, Campus of Agriculture and Natural Resources, University of Tehran, PC 31587-77871 Karaj, Iran

autor

Moradi-shahrbabak M.

• Department of Animal Science, Campus of Agriculture and Natural Resources, University of Tehran, PC 31587-77871 Karaj, Iran

autor

Anele U. Y.

• Department of Animal and Food Sciences,Texas Tech University, Lubbock 79409-2141, Texas, USA

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