Intake of milk and pasture and growth rate of calves reared by cows with high or low potential for milk production
| Autor: | S. T. Morris, Paul R. Kenyon, Nicolas Lopez-Villalobos, Rebecca Hickson, F. J. Roca Fraga, Martin Np |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
geography
geography.geographical_feature_category Animal breeding 0402 animal and dairy science food and beverages 04 agricultural and veterinary sciences Beef cattle Biology Milk production 040201 dairy & animal science Pasture Crossbreed fluids and secretions medicine.anatomical_structure Animal science Lactation 040103 agronomy & agriculture medicine 0401 agriculture forestry and fisheries Weaning Animal Science and Zoology Growth rate Food Science |
| Zdroj: | Animal Production Science. 58:523 |
| ISSN: | 1836-0939 |
| DOI: | 10.1071/an16256 |
| Popis: | Milk production of cows influences calf weaning weight, which is the major driver for economic return in a cow–calf operation. The growth trajectory of 64 steer calves resulting from a terminal cross between Angus or Simmental bulls with Angus, Angus cross Holstein Friesian, Angus cross Jersey and Angus cross KiwiCross cows was examined during the pre-weaning period from birth (D0) to weaning (D148) and during the post-weaning period until a year of age (D365). Random regression models were used to model milk intake and liveweight of calves throughout lactation. These models were a good fit to the data (r2 = 0.77 for milk intake and r2 = 0.99 for liveweight). Total energy intake from milk was greater (P < 0.05) for the Angus cross Holstein Friesian-, Angus cross Jersey- and Angus cross KiwiCross-reared steers than for those reared by Angus dams. Additional milk intake increased liveweight of steers from D90 to D365, but the magnitude of the effect decreased as the calves aged. Simmental-sired steers had a greater liveweight response to additional milk intake than Angus-sired steers at D120 and D148, probably reflecting greater growth potential from out-crossed calves. |
| Databáze: | OpenAIRE |
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