Ferraretto L.F.,University of Wisconsin - Madison |
Shaver R.D.,University of Wisconsin - Madison |
Massie S.,Renaissance Nutrition Inc. |
Singo R.,Renaissance Nutrition Inc. |
And 2 more authors.
Professional Animal Scientist | Year: 2015
The objective of this study was to evaluate the effect of ensiling time and hybrid type on fermentation profile, N fractions, and ruminal in vitro starch (ivSD; 7 h) and NDF (ivNDFD; 30 h) digestibility in whole-plant corn silage (WPCS). Samples from 8 hybrids [4 leafy (LFY) and 4 brown midrib (BMR)] were collected at harvest, vacuum-sealed in plastic bags, and ensiled for 0, 30, 120 and 240 d. Starch and DM concentration were unaffected (P > 0.10) by ensiling time or hybrid type. Ethanol concentration and pH were greater (P = 0.01) for LFY than BMR, but lactate and acetate did not differ (P > 0.10). Soluble-CP concentrations tended (P = 0.09) to be greater for LFY than BMR, but ammonia-N and ivSD concentrations were unaffected (P > 0.10) by hybrid type. Measurements of lactate, acetate, and total VFA concentrations were greater (P < 0.01) for whole-plant corn silage fermented for 30, 120, and 240 d compared with unfermented samples. Gradual increases were observed (P = 0.001) from 0 to 240 d for soluble CP (33.5, 41.2, 48.9, and 54.5% of CP for 0, 30, 120, and 240 d, respectively) and ammonia-N (2.6, 4.6, 6.0, and 7.9% of N for 0, 30, 120, and 240 d, respectively). Likewise, ivSD measurements increased (P = 0.001) with ensiling time. The ivNDFD measurements were greater (P = 0.001) for BMR than LFY but were not affected (P > 0.10) by ensiling time. Positive relationships between ivSD and ammonia-N or soluble CP were observed (P = 0.001). Fermentation profile, ammonia-N, soluble CP, and ivSD were greatly influenced by ensiling time but minimally by hybrid type. The ivNDFD was affected by hybrid type but not ensiling time. Ammonia-N and soluble CP were good indicators of ivSD in wholeplant corn silage. © 2015 American Registry of Professional Animal Scientists.
Shepherd D.M.,Ohio State University |
Shepherd D.M.,Renaissance Nutrition Inc. |
Firkins J.L.,Ohio State University |
VonBehren P.,Cargill Inc.
Journal of Dairy Science | Year: 2014
We used a novel corn wet-milling coproduct [CMP; approximately 70% dry matter, 28% crude protein, 36% neutral detergent fiber (NDF), and 18% nonstructural carbohydrates] in diets formulated to contain 18.4% forage NDF, 17.4% crude protein, 20.2% starch, and 3.7% sugar. Six primiparous, rumen-cannulated Jersey cows were assigned to a 6 × 6 Latin square design with a 2 × 3 factorial arrangement of treatments. Diets were formulated to contain 20 and 30% CMP with 3 forage sources [corn silage (CS) and 40.5% NDF, CS replaced with 10% alfalfa hay (AH) and 45.0% NDF, or CS replaced with 7% grass hay (GH) and 67.4% NDF], with each providing 18.4% forage NDF in the diet. Total-tract digestibilities of NDF, N, and organic matter were not affected by treatment. Similarly, no treatment effects were detected for kinetics of NDF disappearance in situ from CMP or respective forage source or for N disappearance in situ from CMP. Grass hay increased total and liquid pool size of rumen contents compared with AH (by 3.2 and 3.0. kg, respectively). Total time spent chewing increased in cows fed GH by over 35. min compared with those fed AH, partially due to a trend for increased minutes spent ruminating. Mean particle size of rumen contents also tended to be higher in the GH (0.55. mm) than AH (0.69. mm) diets. No effects on production of milk or milk components were detected, but dry matter intake (DMI) tended to decrease when CMP increased from 20 to 30%. Gross feed efficiency (fat-corrected milk/DMI) tended to be greater when cows were fed AH and GH compared with CS and was greater for AH than GH diets. In diets containing low starch, increasing CMP from 20 to 30% potentially maintained similar fat-corrected milk production with lower DMI. However, more consideration also should be given to interactions among forages with respect to fill, digestion, and passage of fiber with increased inclusion rates of CMP. © 2014 American Dairy Science Association.
Renaissance Nutrition Inc. | Date: 2012-07-18
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