Genotypic influences on norepinephrine-induced change in thermogenesis and plasma constituents in newborn calves /
(34.3% decrease in TB vs TA), intermediate for B-sired
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (34.3% decrease in TB vs TA), intermediate for B-sired (cortisol, triiodothyronine, T3; thyroxine, T4) <.01) concentrations were higher in calves bom to B dams than A (n = 7), and T x B (n = 9) calves. Norepinephrine-induced A dams. Moreover, plasma T4 concentrations were 28.6% higher and reflected treatment differences found in PMR. At birth, plasma NEFA (P < .001), cortisol (P <.10), and T3 (P bom to B dams have lower nonshivering therrnogenic Bos indicus breeding. Brahman (B; n = 10), A x B (n = 7), B x A (n = 8), Tuli (T) x breed dependent (sire x dam interaction; P < .00 1). The B calf breed types and averaged 28.5 cal - kg-I - min-1. calves (1 5.3% decreased in BB vs BA) and lowest for A-sired calves (4. 1 % decrease in AB vs AA). Peak tympanic Calves bom to B dams had lower (P <.0001) weight-specific capabilities than calves bom to A dams, which may be a concentrations were measured in newborn Angus (A; n = 5), contributing factor to higher neonatal mortality in calves of function. At birth each calf was fed colostrum and fitted However, the magnitude of the reduction for PMR was sire in calves bom to B dams than A dams at birth and following kg-I - min-1 for 4 min. Calves bom to B dams were 12.9% lighter than calves bom to A dams. Weight-specific matemal reduction in PMR was greatest for T-sired calves measured by indirect calorimetry and blood samples collected norepinephrine infusion. These results suggest that calves peak metabolic rates (PMR) than calves bom to A dams. peak metabolic rates are reflective of brown adipose tissue prior to and following norepinephrine infusion at 35 jig - temperatures were significantly correlated with PMR (r = .46) thermogenesis, plasma metabolite (glucose, NEFA), and hormone Thermoneutral and norepinephrine-induced changes in therrnoneutral metabolic rates (TMR) were similar for all with an indwelling jugular catheter. Heat production was |
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| Item Description: | "Major subject: Nutrition". Vita. |
| Physical Description: | x,88 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |