Use Of Pro Sil Treated Corn Silage And Fababean Silage In Rations For Lactating Dairy Cows
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Use Of Pro Sil Treated Corn Silage And Fababean Silage In Rations For Lactating Dairy Cows
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Author : Felix Budara Bareeba
language : en
Publisher:
Release Date : 1980
Use Of Pro Sil Treated Corn Silage And Fababean Silage In Rations For Lactating Dairy Cows written by Felix Budara Bareeba and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1980
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Dissertations, Academic categories.
Effect Of Feeding Corn Silage Based Diets Predicted To Be Deficient In Either Ruminal Nitrogen Or Metabolizable Protein On Nitrogen Utilization And Efficiency Of Use In Lactating Cows
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Author : Erin Beth Recktenwald
language : en
Publisher:
Release Date : 2007
Effect Of Feeding Corn Silage Based Diets Predicted To Be Deficient In Either Ruminal Nitrogen Or Metabolizable Protein On Nitrogen Utilization And Efficiency Of Use In Lactating Cows written by Erin Beth Recktenwald and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Due to concern over nitrogen (N) emissions, this study attempted to evaluate dietary approaches to reduce N excretion by dairy cattle. Knowledge about potential N sources that were either unaccounted for or under-predicted by CPM Dairy and the Dairy NRC (2001) was used to formulate rations that were much lower in crude protein (CP) than typically fed to dairy cattle but would potentially not decrease production. Specifically, the three diets fed were predicted to have: (1) positive rumen N and metabolizable protein (MP) balances (Diet P) (2) negative MP balance and positive rumen N balance (Diet N), or (3) negative rumen N balance but positive MP balance (Diet T) as predicted by CPM Dairy version 3. The objective of this experiment was to determine whether, and to what extent, the decrease in predicted ruminally available N and MP supply would affect milk production. Eighty-eight multiparous lactating Holstein cows (83 ± 20 DIM), were blocked by average daily milk yield to 50 DIM and parity and assigned to three diets differing in N content or predicted rumen degradability of the feed N. The diets were formulated with CPM Dairy V3 using library values for all feeds except corn silage where actual chemical, digestibility, and degradation rate values were determined and used. The diets (DM basis) consisted of approximately 50% corn silage, 2% wheat straw and 48% of a diet specific ingredient mix and were formulated for 22.2 of kg DMI. Actual diet CP levels were 16.7, 14.2 and 14.3% for Diets P, N and T, respectively. The predicted CPM Dairy rumen N balance at the formulated DMI was 29 and 27 g for Diets P and N and negative 39 g/d for Diet T, whereas the predicted MP balance was 263 and negative 145 and 91 g/d for Diets P, N and T, respectively. Monensin was included in the diets at a formulated intake of approximately 300 mg per cow per d and somatotropin was administered per label. Actual DMI for cattle fed these treatments were 25.7, 25.5 and 24.2 kg/d for Diets P, N and T, respectively and were significantly lower for Diet T. Actual milk yield was 45.0, 42.6 and 43.3 kg/d and 3.5% FCM was 38.1, 36.5, and 36.4 kg/d for cows fed Diets P, N and T, respectively and was significantly lower for cows fed Diets N and T. Milk protein percent was not affected by diet; however, milk protein yield was significantly greater for cows fed Diet P due to the difference in milk yield. Plasma urea N concentrations were 11.31, 8.40 and 7.13 mg/dl for cows fed diets P, N and T, respectively and were different and paralleled the rumen ammonia levels of 8.32, 6.58 and 5.84 mg/dl. Milk fat depression (MFD) was observed in all cows and was not affected by treatment, and the average milk fat levels were 2.67, 2.68 and 2.54% for diets P, N and T, respectively. To determine if monensin was partially responsible for the MFD, monensin was removed from the diets of approximately half of the cows on treatment once they had finished the experimental period. Removal of monensin resulted in a 30% increase in milk fat percent, and milk protein content was not affected. Calculated milk N:intake N ratios for the three treatments were 0.31, 0.33 and 0.36 for Diets P, N and T respectively. The results of this study suggest that more productive N is available than currently predicted by either CPM Dairy and the Dairy NRC (2001). Understanding where these differences exist would allow for feeding less CP to dairy cattle and decreasing N emissions to the environment. It may also be a profitable strategy for dairy farmers, as they would be able to reduce their purchase of costly protein feeds, but that was not demonstrated in this study - primarily due to the severe milk fat depression that decreased the economic value of milk. However, ration cost was not a concern for this experiment, and that aspect can be considered when implementing feeding strategies stemming from this research. (Abstract).
Comprehensive Dissertation Index Agriculture
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Author :
language : en
Publisher:
Release Date : 1984
Comprehensive Dissertation Index Agriculture written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Dissertations, Academic categories.
Effect Of Anhydrous Ammonia Treated Corn Silage On The Performance Of Growing And Finishing Steers
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Author : Lyle Wayne Lomas
language : en
Publisher:
Release Date : 1979
Effect Of Anhydrous Ammonia Treated Corn Silage On The Performance Of Growing And Finishing Steers written by Lyle Wayne Lomas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Beef cattle categories.
Evaluation Of An Amylase Enabled Corn Silage In Lactating Cows
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Author : Sergio Cueva Welchez
language : en
Publisher:
Release Date : 2021
Evaluation Of An Amylase Enabled Corn Silage In Lactating Cows written by Sergio Cueva Welchez and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
An experiment was conducted to investigate the effects of an amylase-enabled corn silage on the lactation performance, enteric gas emission and rumen fermentation of lactating dairy cows. The amylase-enabled corn hybrid (Enogen; Syngenta Seeds LLC) was harvested, ensiled, and included in the diet at 40% of dry matter (DM) of the cows. The Enogen corn silage (ECS) was compared with silage from a control (CON) isogenic corn hybrid without the amylase trait. Both silages were included at the same inclusion rate of dietary DM and the diet fed, with exception of the silage source, was identical between the treatments. The purpose of the experiment was to investigate the effect of ECS on lactational performance, enteric gas emission, and rumen fermentation of lactating dairy cows. Both corn hybrids were grown for approximately 130 d, and silages were fermented for approximately 220 d before the beginning of the animal experiment in April 2019. At harvest, the CON hybrid yielded approximated 1.1 t of DM/ha more than the ECS hybrid. Crude protein concentration was 6% lesser in ECS when compared with the CON hybrid. Acid detergent fiber was also 3.9% lesser for ECS. Furthermore, the ECS was greater in starch content, when compared with the CON (9.3%, on average). As expected, the amylase activity in ECS was 13-fold greater when compared with the CON silage. Nevertheless, the differences mentioned in the nutritional content of the silages, did not result in major differences in fermentation end-products between the silages. Inclusion of ECS at 40% dietary DM did not affect DMI but increased MY (40.8 vs 38.8 kg/d), improved feed efficiency (1.55 vs. 1.47 kg/kg) and tended to improve energy-corrected milk yield (ECM) feed efficiency in lactating cows (1.50 vs. 1.45 kg/kg). Milk lactose was greater (4.92 vs 4.86 %) for cows fed the ECS diet, relative to CON, but milk protein and fat contents were similar. Methane emission intensity (per unit of milk yield) was decreased by the ECS diet compared with CON; however, treatment did not affect CH4 emission intensity expressed per kilogram of ECM. Rumen fermentation, apart from a decreased molar proportion of butyrate in rumen fluid of ECS-fed cows, was not affected by treatment. Amylase activity was numerically, but not statistically, greater in rumen fluid of ECS-fed cows, however, the difference could be related both to a greater amylase activity in ECS (as previously described) and greater starch intake with the ECS diet, when compared with CON. As suspected, intake of starch was greater in cows fed the ECS diet relative to CON, and apparent total-tract DM digestibility also tended to be greater in cows fed the ECS. There were no differences in intakes in any of the other nutrients or their apparent total-tract digestibility. Nitrogen intake and utilization, as well as urinary purine derivative excretion, were not affected by the silage treatment. Effects induced by ECS were likely a result of the greater starch content in ECS and greater overall availability of digestible nutrients. Moreover, given that ECS decreased CH4 emission intensity (per unit of MY, but not of ECM), data would suggest that the carbon footprint of milk production could be reduced by inclusion of ECS, Inclusion of an amylase-enabled hybrid in dairy rations showed promising effects by improving feed efficiency and ECM feed efficiency in dairy cows. However, the amylase-enabled corn silage used in the current experiment tended to have a greater overall availability of digestible nutrients and was greater in starch content, when compared with its isogenic counterpart. In this regard, effects observed on cow performance can be attributed, at least partially, to differences in silage nutritional composition. Research investigating the effects of feeding amylase-enabled corn silages to dairy cows is limited. This makes it challenging to concretely determine the mode and extent of action of the amylase enzyme in the current study. Thus, future research on amylase-enabled hybrids should be focused on determining modes and stages of action of the enzyme, potential nutritional and environmental benefits in dairy cows, and possible interactions with other additives or dietary ingredients. The amylase-enabled technology seems to be promising, however, questions remain that must be answered to fully understand the benefits of the inclusion of amylase-enabled corn in dairy cow diets.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1980
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Dissertation abstracts categories.
Effects Of Bm3 Corn Silage On The Lactational Performance Of Dairy Cows
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Author : Richard A. Longuski
language : en
Publisher:
Release Date : 2003
Effects Of Bm3 Corn Silage On The Lactational Performance Of Dairy Cows written by Richard A. Longuski and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Corn categories.
The Effects Of Feeding Corn Silage That Was Exposed To Air For Five Days With Or Without Yeast Cell Walls On Production Parameters In Early Lactation Holstein Cows
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Author :
language : en
Publisher:
Release Date : 2002
The Effects Of Feeding Corn Silage That Was Exposed To Air For Five Days With Or Without Yeast Cell Walls On Production Parameters In Early Lactation Holstein Cows written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Proper silage management is important in reducing excessive spoilage due to air exposure. The objective of this study was to compare the effects on production of feeding silage that was exposed to air for five days and Yeast Cell Walls (YCW) to Holstein cows. Forty-eight early lactation cows were randomly assigned at calving to one of four treatment diets within parity. Diets included: Diet 1 corn silage blended into a TMR (CON), 2) CON with added Yeast Cell Walls (CON+YCW), 3) silage that was exposed to air for five days blended into a TMR (EXP), 4) EXP with added Yeast Cell Walls (EXP +YCW). Cows were started on trial at 21 days in milk (DIM). Cows received the same silage type for the duration of the experiment, but switched YCW treatment at the experimental midpoint (45 d). CON corn silage was stored in a covered trench silo for the length of the study. EXP silage was taken from the same trench silo and piled under a covered shelter for 5 days before being blended into the TMR based on prior DM change. Blood and rumen fluid samples were collected on days 30, 44, 75, and 89 of the experiment and analyzed for parameters important for health and production. There were no significant differences in %CP, %ADF, and Mcal/kg NEL for treatment diets. Milk yield (35.87, 36.72, 36.58 and 37.07 kg/d), DMI (23.18, 22.09, 23.44, and 23.88 kg DM), % fat (3.23, 3.22, 3.22, and 3.18%), fat yield (1.16, 1.17, 1.16, 1.19 kg), %CP (2.86, 2.87, 2.80, and 2.79%), and protein yield (1.03, 1.05, 1.02, and 1.03 kg) were not significantly different among CON, CON+YCW, EXP, and EXP+YCW, respectively (P> 0.10). Acetate: propionate ratio was not significantly different among treatments CON, CON+YCW, EXP, EXP+YCW, respectively (2.4, 2.3, 2.4, and 2.3; P> 0.10). Concentrations of blood urea nitrogen (BUN) (19.8, 20.2, 21.0, and 22.8 mg/dl), rumen ammonia (10.7, 10.9, 9.9, and 9.8 mg/dl), as well as rumen pH (6.9, 6.8, 6.9, and 6.8) were not significantly different among treatments C.
Canadian Theses On Microfiche Catalogue
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Author :
language : en
Publisher:
Release Date : 1982
Canadian Theses On Microfiche Catalogue written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Dissertations, Academic categories.