Effect of forage-concentrate ratio in complete feeds fed ad libitum on energy intake in relation to requirements by dairy cows.
TLDR
Cows in the latter stages of lactation did not appear to regulate their intake according to physiological requirements for milk production, and cows in the groups fed higher concentrate feeds achieved energy balance earlier.About:
This article is published in Journal of Dairy Science.The article was published on 1974-11-01 and is currently open access. It has received 73 citations till now. The article focuses on the topics: Energy balance.read more
Citations
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The effect on performance of different energy concentrations in complete rations for first lactation cows before and after calving
TL;DR: An increase in the energy concentration in the complete rations in Period 2 had a highly significant effect on feed intake, milk production, and daily gain of the three groups and no significant effects were found on milk composition.
Journal ArticleDOI
An overview of animal science research 1945–2011 through science mapping analysis
TL;DR: The results show how genomic studies gain in weight and integrate with other thematic areas and how animal welfare, sustainable management and human health play a major role would affect the future structure and management of livestock farming.
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Effects of different concentrate levels on milk yield, feed intake, live weight change, health and reproduction in dairy cows
TL;DR: The amount of concentrates had no influence on health and reproductive performance and milk protein content increased from 3.27% to 3.42% with increasing amounts of concentrate, while the intake of forage was lower in the two groups with higher intakes.
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Complete diets for dairy cows: the effect of energy concentration and change in energy concentration of a complete diet on intake and performance of lactating dairy cows.
TL;DR: During the complete experimental period, weeks 3–20, animals on treatments HH, HM, MM and ML had mean D.M.M intake, milk yield and milk-protein concentration decreased, however, milk-fat concentration and live-weight change were generally unaffected.
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Individual Versus Group Feeding of Constant Versus Variable Forage:Concentrate of Total Mixed Rations Through Two Lactations and Intervening Dry Period
J.E. Keys,J.E. Keys,R.E. Pearson,R.E. Pearson,N.W. Hooven,N.W. Hooven,H.F. Tyrrell,H.F. Tyrrell,G.W. Bodoh,G.W. Bodoh +9 more
TL;DR: In this article, total mixed rations were fed for ad libitum consumption to four groups of cows through two lactations and intervening dry period, and the results indicate a disadvantage to feeding high concentrate treatments through the lactation and dry period.
References
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Prediction of the energy value of cow's milk.
H.F. Tyrrell,J. T. Reid +1 more
TL;DR: This equation predicted the milk energy output of cows producing low-fat milk effected by dietary means as accurately as that of normal milk after analysis of the relationships among the energy value and the concentrations of total solids, solids-not-fat, and milk.
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Development of a Comprehensive System of Feed Analyses and its Application to Forages
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Regulation of Feed Intake in Dairy Cows. I. Change in Importance of Physical and Physiological Factors with Increasing Digestibility
TL;DR: It was concluded that physical and physiological factors regulating feed intake change in importance with increasing digestibility, and intake appeared to be dependent on metabolic size, production, and digestibility at higher digestibilities.
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Energetics of Body Tissue Mobilization
P.W. Moe,H.F. Tyrrell,W.P. Flatt +2 more
TL;DR: It appears unrealistic to relate tissue energy changes to live weight change without some consideration being given to the change in rumen fill, but data from this laboratory suggest that milk may be produced from body tissue reserves with an efficiency of 82 to 84% and that theBody tissue reserves may be replenished in late lactation by deposition of body tissue with a efficiency equal to or exceeding that of milk production.