Body composition of postpubertal gilts at nutritionally induced anestrus1
| Autor: | S. M. el Kandelgy, J. E. Pettigrew, S. G. Cornelius, D. W. Rozeboom, R. L. Moser |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Journal of Animal Science. 71:426-435 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.2527/1993.712426x |
| Popis: | An experiment using comparative slaughter was conducted to examine the relationship between occurrence of nutritionally induced anestrus in postpubertal gilts and chemically determined body composition and body composition changes. Thirty-nine Duroc x (Yorkshire x Landrace) gilts, each having experienced three or more estrous cycles, were used. Nine gilts were chosen randomly, weighed, ultrasonically scanned for 10th rib backfat thickness, and slaughtered to determine initial body composition. Remaining gilts were allotted randomly to five dietary treatments, four characterized as severely energy restrictive (RES; .25, .50, .75, and 1.0 mcal of ME/d) and a control (3.4 Mcal of ME/d). Dietary treatments provided equal amounts of protein (50 g), minerals, and vitamins daily. Individual serum progesterone levels were determined every 3 d using RIA and gilts were considered anestrous when concentrations were .10) on the quantity of body protein or fat lost, or on the quantity of body protein or fat remaining at anestrus. However, individual body protein and body fat contents of RES gilts at slaughter revealed that anestrus occurred at a wide range of body compositions, from 13.4 to 20.2 kg of protein and .36 to 27.0 kg of fat. This wide range of individual values suggests that estrous activity in the mature gilt is not controlled by specific threshold levels of body reserves. |
| Databáze: | OpenAIRE |
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