| Автор | Hohenboken, William D. |
| Автор | Foldager, John |
| Автор | Jensen, Just |
| Автор | Madsen, Per |
| Автор | Andersen, Bernt Bech |
| Дата выпуска | 1995 |
| dc.description | AbstractRed Danish (RD), Danish Friesian (DF), Danish Red and White (RW) and Danish Jersey (DJ) heifers had ad libitum access to total mixed rations designed to promote low (L), medium (M) or high (H) growth rate from 6 weeks of age to approximately the time of puberty. Heifers then were managed uniformly through 250 days of their first lactation. Paternal half-brothers of the heifers were tested from 6 weeks to 11 months of age on a high concentrate or on a roughage diet. For prepubertal feed intake, growth and efficiency of feed utilization of heifers, breed and rearing intensity effects were important, but breed x rearing intensity interactions were non-significant or inconsistent. Breed and rearing intensity effects were important but their interaction was not for precalving weight gain, calving weight, milk yield, and feed intake and efficiency during lactation. Females of the larger breeds ate more, grew more rapidly, were heavier and produced more energy corrected milk than Danish Jerseys; but breeds did not differ for efficiency of nutrient utilization during lactation or for post-partum weight change patterns. Increased prepubertal daily gains induced by higher-energy diets were associated with lower subsequent milk yield and reduced energy intake during lactation. The RD, DF and RW bulls ate more and grew more rapidly than DJ bulls. Daily energy intake and gain were higher for concentrate-fed than for roughage-fed bulls. Breed and dietary energy level did not interact significantly for these traits. In conclusion, there was little evidence that Danish dairy and dual-purpose cattle breeds differed in the sensitivity of their subsequent milk yield to excessive rates of gain during the rearing period or in response of young bulls to high concentrate versus roughage diets. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | efficiency |
| Тема | life cycle |
| Тема | breeds |
| Тема | cattle |
| Тема | interaction |
| Название | Breed and Nutritional Effects and Interactions on Energy Intake, Production and Efficiency of Nutrient Utilization in Young Bulls, Heifers and Lactating Cows |
| Тип | research-article |
| DOI | 10.1080/09064709509415836 |
| Electronic ISSN | 1651-1972 |
| Print ISSN | 0906-4702 |
| Журнал | Acta Agriculturae Scandinavica, Section A – Animal Science |
| Том | 45 |
| Первая страница | 92 |
| Последняя страница | 98 |
| Аффилиация | Hohenboken, William D.; Department of Research in Cattle and Sheep, National Institute of Animal Science, Research Centre Foulum |
| Аффилиация | Foldager, John; Department of Research in Cattle and Sheep, National Institute of Animal Science, Research Centre Foulum |
| Аффилиация | Jensen, Just; Department of Research in Cattle and Sheep, National Institute of Animal Science, Research Centre Foulum |
| Аффилиация | Madsen, Per; Department of Research in Cattle and Sheep, National Institute of Animal Science, Research Centre Foulum |
| Аффилиация | Andersen, Bernt Bech; Department of Research in Cattle and Sheep, National Institute of Animal Science, Research Centre Foulum |
| Выпуск | 2 |
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| Библиографическая ссылка | Wang, S., Roy, G. L., Lee, A. J., McAllister, A. J., Batra, T. R., Lin, C. Y., Vesely, J. A., Wauthy, J. M. and Winter, K. A. 1992. Genetic line x concentrate level interactions for milk production and feed efficiency in dairy cattle. Can. J Anim. Sci., 72: 227–236. |
