Effect of Fat Supplementation of Steers Grazing Wheat Pasture on Forage Intake and Digestion, Grazing, and Feedlot Performance PDF Download
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Author: Darick A. Chabot
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 146
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Author: Darick A. Chabot
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 146
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Author: Gary John Vogel
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ISBN:
Category :
Languages : en
Pages : 188
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Author:
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ISBN:
Category : Medicine
Languages : en
Pages : 1836
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Author: Ulises A. Sanchez-Sandoval
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Category :
Languages : en
Pages : 84
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Eight Angus cross-bred cows (669 ± 23.2 kg of BW) fitted with duodenal and ruminal cannulas grazing winter wheat pasture (WWP) were used in a split-plot design to evaluate the effects of monensin supplementation and WWP stage of maturity on forage intake, digestive function, metabolizable protein, and ruminal fermentation. Supplemental treatment was the main plot, and stage of maturity was the subplot. Two levels of monensin supplementation: 1) Control (CON; 1.0 kgcow−1d−1 of wheat middling only), and 2) monensin (MON; CON plus 200 mg of monensin); and two stages of WWP maturity: 2) mid-March (MAR; March 13 to March 26; vegetative stage), and 2) early April) (APR; March 27 to April 8; heading stage) of 2017 were compared in a 2 x 2 factorial arrangement of treatments. Cows grazed in a single wheat pasture with supplements deposited directly into their rumens through their rumen cannula at 0700 daily. Monensin supplementation did not affect forage intake (P = 0.64), nutrient flow to duodenum (P ≥ 0.47) or total tract digestion expressed as kg/d (P > 0.45). Although, OM and CP flowing to the duodenum were not affected by monensin supplementation (P ≥ 0.53), microbial OM and microbial CP decreased (P = 0.03) with monensin supplementation. As stage of maturity of WWP advanced, forage intake (P = 0.02), ruminal digestibility of DM and OM (P ≤ 0.05) and total tract digestion expressed as kg/d (P = 0.01) decreased. Also, total duodenal CP (P = 0.01), microbial protein (P = 0.01), and feed protein (bypass protein; P = 0.03) flow decreased with advancing WWP stage of maturity. Monensin supplementation increased (P = 0.01) propionate (18.38, and 20.79 ± 0.55 mol/100 mol), and decreased (P = 0.01) the acetate: propionate ratio (3.26, and 2.73 ± 0.13). Ruminal pH (6.03 and 6.31 ± 0.08), acetate (54.6 and 58.3 ± 0.98 mol/100 mol), and acetate propionate ratio (2.52, and 3.48 ± 0.13) increased (P ≤ 0.04), and propionate (21.9, and 17.3 ± 0.56 mol/100 mol) decreased (P ≤ 0.05) with advancing WWP stage of maturity. Results suggest that monensin increases propionate without affecting forage intake, digestibility or metabolizable protein of cattle grazing WWP. Key words: metabolizable protein, microbial synthesis, monensin, winter wheat pasture
Author:
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Category : Livestock
Languages : en
Pages : 962
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Author:
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ISBN:
Category : Agriculture
Languages : en
Pages : 1732
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Author:
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ISBN:
Category : Agriculture
Languages : en
Pages : 982
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Author: Bret Hess
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 206
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Author: Jorge A. Rodela
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ISBN:
Category :
Languages : en
Pages : 90
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Eight ruminally and duodenally cannulated, angus-crossbred cows (665 ± 20.6 kg) grazing winter wheat pasture (WWP) were used in a complete randomized design to evaluate the effects of fish meal (FM) supplementation on forage intake, characteristics of digestion and metabolizable protein of cattle grazing WWP. The experiment was conducted from March 7 through March 19, 2016. Treatments consisted of cows grazing in a single pasture and supplemented with FM to provide: control, no RUP supplement (CON), or FM supplemented at a level calculated to supply 10% of the forage CP intake as RUP (FM). Supplemental FM was placed directly into the rumen cannula once daily at 0700 h. Forage DM, NDF, CP, total OM intake, OM intake expressed as g/kg of BW were not affected (P ≥ 0.44) by FM supplementation. Also, supplemental FM had no effects on microbial protein efficiency (P = 0.34), microbial protein synthesis (P = 0.70), feed protein bypassing rumen fermentation (P = 0.72), or total CP flowing to duodenum (P = 0.07). Moreover, true ruminal, or total tract digestibility of OM, NDF, and CP were not affected (P ≥ 0.38) by FM supplementation. Ruminal pH (6.37, and 6.43 ± 0.09 for CON and FM, respectively), total VFA production (50.2, and 49.7 ± 0.1.74 mM for CON and FM, respectively), acetate (74.4, and 74.6 ± 0.77 mol/100 mol for CON and FM, respectively), propionate (16.7, and 16.1 ± 0.62 mol/100 mol for CON and FM, respectively) and acetate/propionate ratio (4.49 and 4.69 ± 0.22 for CON and FM, respectively) were not affected by FM supplementation (P ≥ 0.49). Although FM supplementation did not decrease forage intake, it failed to improve MP of cows grazing WWP. The results indicate that improvements in performance of cattle grazing WWP should not be expected with supplementing FM at the level supplemented in this experiment
Author:
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ISBN:
Category : Agriculture
Languages : en
Pages : 510
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