Body composition and metabolic profiles associated with puberty in beef heifers1
| Autor: | J B Hall, W M Moseley, R. A. Bellows, R B Staigmiller, R E Short, S E Bellows |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Estrous cycle
medicine.medical_specialty animal structures animal diseases Nutritional status General Medicine Biology Beef cattle Live animal Endocrinology medicine.anatomical_structure Internal medicine Metabolic markers Genetics medicine Animal Science and Zoology Composition (visual arts) Corpus luteum Blood urea nitrogen Food Science |
| Zdroj: | Journal of Animal Science. 73:3409-3420 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.2527/1995.73113409x |
| Popis: | Rapid growth large frame (RL, n = 61) or average growth medium frame (AM, n = 71) biotype heifers fed to achieve either moderate (MOD, .6 kg/d) or high ADG (HI, 1.0 kg/d) were used to determine whether puberty occurs at similar body composition or metabolic status. A heifer was consi- dered pubertal after being detected in estrus and then forming a functional corpus luteum. Live animal estimates of body composition and blood samples for assessment of metabolic status were taken at 13 ± .2 d after estrus for all heifers. Body composition and metabolic status were assessed every 56 d from 7 mo of age until puberty in a subset of 80 heifers representing all biotype-diet combinations. At puberty, 32 of these 80 heifers were slaughtered and physical and chemical composition of the empty body were determined. High-gain diet heifers were younger, heavier, taller, and more muscular (all P < .01) at puberty than MOD heifers. Slaughter measurements paralleled live animal estimates; bodies of HI and RL heifers contained more ( P < .01) carcass and noncar- cass components than those of MOD and AM heifers, respectively. Carcasses of RL and HI heifers were more ( P < .05) muscular and fatter than AM and MOD heifers. At puberty, HI heifers had a greater ( P < .01) mass of moisture, fat, and fat-free organic matter (FFOM) than MOD, whereas RL heifers had more moisture, ash, and FFOM than AM. Percentage of fat was greater (22.1 ± 1.0 vs 19.1 ± 1.0; P < .05) and percentage of moisture was less (55.4 ± .6 vs 58.1 ± .6; P < .01) in bodies of HI than in those of MOD heifers. Concentrations of blood urea nitrogen and insulin were greater ( P < .05) in HI than in MOD heifers. Diet did not influence concentration of IGF-I or glucose, and metabolic markers were unaffected by biotype. No dramatic changes in body composition or metabolic signals were detected before puberty. Puberty did not occur at similar body composition or metabolic status in all heifers. |
| Databáze: | OpenAIRE |
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