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Journal of Dairy Research
Gordin, S., Volcani Institute of Agricultural Research, Bet Dagan, and Faculty of Agriculture, Hebrew University, Rehovot, Israel
Volcani, R., Volcani Institute of Agricultural Research, Bet Dagan, and Faculty of Agriculture, Hebrew University, Rehovot, Israel
Birk, Y., Volcani Institute of Agricultural Research, Bet Dagan, and Faculty of Agriculture, Hebrew University, Rehovot, Israel
Two levels of roughage, 3 FU (feed units) and 5 FU daily, were fed to Israeli-Friesian cows and heifers receiving either a normal (Normal) or a high-energy (High) diet. Milk yield and composition were examined for 12 weeks following parturition. The animals receiving 5 FU of roughage daily showed a higher milk yield during the first 8 weeks. With the Normal diet the amount of roughage had no effect on milk composition. With the High diet, milk yield was higher than with the Normal, and a depression in fat percentage was observed in the milk of cows and heifers receiving 3 FU daily. No corresponding fall in milk protein percentage was observed - the cows of this group (High-3 FU roughage) showing, in fact, a rise in protein percentage. No differences in milk total solids were found. With these high-energy low-roughage diets no correlation was apparent between milk fat and protein percentages. © 1971, Proprietors of Journal of Dairy Research. All rights reserved.
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The effect of varying ratios of roughage to concentrates on composition and yield of cow's milk
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Gordin, S., Volcani Institute of Agricultural Research, Bet Dagan, and Faculty of Agriculture, Hebrew University, Rehovot, Israel
Volcani, R., Volcani Institute of Agricultural Research, Bet Dagan, and Faculty of Agriculture, Hebrew University, Rehovot, Israel
Birk, Y., Volcani Institute of Agricultural Research, Bet Dagan, and Faculty of Agriculture, Hebrew University, Rehovot, Israel
The effect of varying ratios of roughage to concentrates on composition and yield of cow's milk
Two levels of roughage, 3 FU (feed units) and 5 FU daily, were fed to Israeli-Friesian cows and heifers receiving either a normal (Normal) or a high-energy (High) diet. Milk yield and composition were examined for 12 weeks following parturition. The animals receiving 5 FU of roughage daily showed a higher milk yield during the first 8 weeks. With the Normal diet the amount of roughage had no effect on milk composition. With the High diet, milk yield was higher than with the Normal, and a depression in fat percentage was observed in the milk of cows and heifers receiving 3 FU daily. No corresponding fall in milk protein percentage was observed - the cows of this group (High-3 FU roughage) showing, in fact, a rise in protein percentage. No differences in milk total solids were found. With these high-energy low-roughage diets no correlation was apparent between milk fat and protein percentages. © 1971, Proprietors of Journal of Dairy Research. All rights reserved.
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