The Effect of Frame Size and Diet on Daily Protein Accretion and Fat Deposition in Young Growing Bulls PDF Download
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Author: Steven Paul Spivey
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 210
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Author: Steven Paul Spivey
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 210
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 564
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Author: Jon Patrick Schoonmaker
Publisher:
ISBN:
Category : Animal nutrition
Languages : en
Pages : 0
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Book Description
Five experiments were conducted to determine the effect of castration status, age at feedlot entry, and energy restriction on protein and fat accretion in early-weaned cattle. Bulls in experiment 1 were heavier and had to stay in the feedlot longer than implanted steers to achieve a similar fat depth. Bulls deposited intramuscular fat more favorably than steers, possibly due to a gradual increase in IGF-I concentration as testicles grew rather than the large fluctuations in IGF-I concentration observed in steers following implantation. Earlier feedlot placement (111, 202, 371 d of age) in experiment 2 resulted in greater quality grades, but lower carcass weights. Delaying feedlot entry age in bulls increased heavy weight carcasses, and reduced intramuscular fat deposition to a greater extent than delaying feedlot entry age in implanted steers. In experiment 3, ad libitum concentrate feeding of early-weaned steers during the growing phase resulted in elevated propionate and insulin at 218 d of age compared to limit- and forage-feeding. Elevated serum insulin, would likely lead to increased uptake of glucose by peripheral tissues, subsequently increasing marbling score at 218 d of age. In experiment 4, normal-weaning steers and forage-feeding of early-weaned steers in the growing phase extended the growth curve compared to limit- and full-feeding high concentrate diets. Ad libitum concentrate feeding caused appreciable amounts of energy to be partitioned to subcutaneous fat, thus accelerating physiological maturity, and reducing intramuscular fat content. In experiment 5, increased fat depth and intramuscular fat percentage at the end of a 160 d growing phase in ad libitum concentrate-fed compared to forage- and limit-fed concentrate Holstein steers resulted in a concomitant increase in lipogenic enzyme activity and adipocyte diameter. Concurrent decreases in adipocytes/g of fat for ad libitum concentrate-fed steers indicate that amount of energy played a larger role than source of energy, and that hypertrophy, rather than hyperplasia, was making a larger contribution to fat deposition in young Holstein steers. Biphasic adipocyte diameter distributions for concentrate-fed steers (ad libitum and limit-fed) at the end of the growing phase indicate that source of energy may be playing a role in when a new population of cells arise.
Author: Peter Thomas Anderson
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 264
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Author: Carl W. Ramm
Publisher:
ISBN:
Category : Beef cattle
Languages : en
Pages : 710
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Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 800
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Author: National Research Council
Publisher: National Academies Press
ISBN: 0309037956
Category : Medical
Languages : en
Pages : 384
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Book Description
This lively book examines recent trends in animal product consumption and diet; reviews industry efforts, policies, and programs aimed at improving the nutritional attributes of animal products; and offers suggestions for further research. In addition, the volume reviews dietary and health recommendations from major health organizations and notes specific target levels for nutrients.
Author: National Research Council
Publisher: National Academies
ISBN: 0309049970
Category : Technology & Engineering
Languages : en
Pages : 94
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Book Description
In the past decade, animal scientists have learned that administering recombinantly derived somatotropin (growth hormone) to cows improves milk production and that giving beta-adrenergic agonists to meat animals improves productivity and leanness. In order for these metabolic modifiers to yield benefits, however, sound management of the animals' nutrition is necessary. This volume reports on how these substances work in the animals' metabolism, what effects they might have on nutrient requirements of domestic livestock, and what information should be developed further by investigators. The book explores the current understanding of the biology, structure, mechanisms of action, and treatment effects of somatotropin, beta-adrenergic agonists, and anabolic steroids. A companion volume to the Nutrient Requirements of Domestic Animals series, this authoritative volume will be required reading for animal scientists, researchers, veterinarians, livestock farmers, and faculty and students in university animal veterinary science programs.
Author: Fulvia Bovera
Publisher: MDPI
ISBN: 3039432524
Category : Science
Languages : en
Pages : 535
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Book Description
This book contains the scientific contributions published within the Animals topical collection “Feeding Strategies to Improve Sustainability and Welfare in Animal Production”. Originally a Special Issue, it has turned into a permanent collection, with its first article being published in July 2019 and more than 30 published articles a year later: evidence of the great interest from the scientific community regarding the topics addressed. The articles, which are grouped by species (poultry, ruminants, pigs, etc.) and by topic, deal with a wide range of arguments that, first of all, highlight the extraordinary complexity and diversity that exists in the animal production sector, and then, the great influence that nutrition and feeding can have in terms of optimizing the use of environmental resources and improving the welfare of farmed animals. In addition, all this is closely connected with the urgent need to safeguard the resources of the planet on which we live.
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1742
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