Arcadia, WI, United States
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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.


Ferraretto L.F.,University of Wisconsin - Madison | Taysom K.,Dairyland Laboratories Inc. | Taysom D.M.,Dairyland Laboratories Inc. | Shaver R.D.,University of Wisconsin - Madison | Hoffman P.C.,University of Wisconsin - Madison
Journal of Dairy Science | Year: 2014

The objectives of the study were (1) to determine relationships between high-moisture corn (HMC) dry matter (DM), ammonia-N [% of crude protein (CP)], and soluble CP concentrations, and pH, with 7-h ruminal in vitro starch digestibility (ivStarchD), and (2) to evaluate the effect of ensiling on pH, ammonia-N, soluble CP, and ivStarchD measurements in HMC. A data set comprising 6,131 HMC samples (55 to 80% DM) obtained from a commercial feed analysis laboratory was used for this study. Month of sample submittal was assumed to be associated with length of the ensiling period. Data for month of sample submittal were analyzed using Proc Mixed in SAS (SAS Institute Inc., Cary, NC) with month as a fixed effect. Regressions to determine linear and quadratic relationships between ivStarchD and ammonia-N, soluble CP, pH, and DM content were performed using Proc Mixed. The ivStarchD increased by 9 percentage units from October to August of the following year. Similar results were observed for ammonia-N and soluble CP with increases from 1.8 to 4.6% of CP and 31.3 to 46.4% of CP, respectively, from October to August of the following year. Ammonia-N was positively related to ivStarchD (R2=0.61). The DM content of HMC at silo removal was negatively related (R2=0.47) to ivStarchD with a decrease of 1.6 percentage units in ivStarchD per 1-percentage-unit increase in DM content. The pH of HMC was negatively related to ammonia-N (R2=0.53), soluble CP (R2=0.57), and ivStarchD (R2=0.51). Combined, ammonia-N, DM, soluble CP, and pH provided a good prediction of ivStarchD (adjusted R2=0.70). Increasing pH, ammonia-N, soluble CP, and ivStarchD values indicate that HMC may need up to 10 mo of ensiling to reach maximum starch digestibility. Ammonia-N, DM content, soluble CP concentration, and pH are good indicators of ruminal in vitro starch digestibility for high-moisture corn. © 2014 American Dairy Science Association.


PubMed | Dairyland Laboratories Inc. and University of Wisconsin - Madison
Type: Journal Article | Journal: Journal of dairy science | Year: 2014

The objectives of the study were (1) to determine relationships between high-moisture corn (HMC) dry matter (DM), ammonia-N [% of crude protein (CP)], and soluble CP concentrations, and pH, with 7-h ruminal in vitro starch digestibility (ivStarchD), and (2) to evaluate the effect of ensiling on pH, ammonia-N, soluble CP, and ivStarchD measurements in HMC. A data set comprising 6,131 HMC samples (55 to 80% DM) obtained from a commercial feed analysis laboratory was used for this study. Month of sample submittal was assumed to be associated with length of the ensiling period. Data for month of sample submittal were analyzed using Proc Mixed in SAS (SAS Institute Inc., Cary, NC) with month as a fixed effect. Regressions to determine linear and quadratic relationships between ivStarchD and ammonia-N, soluble CP, pH, and DM content were performed using Proc Mixed. The ivStarchD increased by 9 percentage units from October to August of the following year. Similar results were observed for ammonia-N and soluble CP with increases from 1.8 to 4.6% of CP and 31.3 to 46.4% of CP, respectively, from October to August of the following year. Ammonia-N was positively related to ivStarchD (R(2)=0.61). The DM content of HMC at silo removal was negatively related (R(2)=0.47) to ivStarchD with a decrease of 1.6 percentage units in ivStarchD per 1-percentage-unit increase in DM content. The pH of HMC was negatively related to ammonia-N (R(2)=0.53), soluble CP (R(2)=0.57), and ivStarchD (R(2)=0.51). Combined, ammonia-N, DM, soluble CP, and pH provided a good prediction of ivStarchD (adjusted R(2)=0.70). Increasing pH, ammonia-N, soluble CP, and ivStarchD values indicate that HMC may need up to 10 mo of ensiling to reach maximum starch digestibility. Ammonia-N, DM content, soluble CP concentration, and pH are good indicators of ruminal in vitro starch digestibility for high-moisture corn.

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