Should Pre-Weaning Calf Diets Include Forage?
Journal of the Hellenic Veterinary Medical Society, ISSN: 1792-2720, Vol: 74, Issue: 4, Page: 6573-6580
2023
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Article Description
The present review article aimed to update and address the biological consequences of forage supply to pre-weaned dairy calves. Early growth and development of a calf play a great role in lifelong performance of the animal. Comprehension of these stages is an important progress achieved in calf nutrition today. Health, milk-solid feed intake and rumen development are the most important factors related to calf growth in pre- and post-weaning periods. It is well understood that fermentation by-products of grain-based starter feeds are essential for increased growth and absorptive capacity of the rumen papillae. In pre-weaned calves, two major hypotheses exist regarding forage feeding. The first hypothesis suggests that the rumen is not fully developed in pre-weaned calves, and forage supply during this period might increase gut fill, thus decreasing starter intake. It is believed that depressed starter intake may limit energy intake and finally suppress calf growth rate. The second hypothesis indicates that rumen pH may decline as the calf ages and starter intake increases. Accordingly, forage supplementation into calf starter diets could prevent further rumen pH decline and subsequent negative consequences while improving starter intake and calf growth. Because research data regarding these hypotheses are controversial, there is no universally accepted standard for feeding calves with forage as a part of starter diets. Many factors, such as milk feeding method, grain, forage type and experimental conditions, could affect calf response to dietary forage. However, there is evidence that limited consumption of forage may be beneficial on rumen health and behavior of calves consuming highly processed (pelleted or finely ground) starter feed in the pre-weaning period.
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