Genetic, nutritional, physiological and anatomical factors affecting fatty acid profiles of bovine adipose tissues /
| Main Author: | |
|---|---|
| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
|
| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | This study was designed to examine variations in fatty acid profiles of muscle and adipose tissues in beef cattle. The first trial (chapter III) assessed the impact of dietary whole cottonseed level on fatty acid composition, growth and carcass traits of beef cattle. There were no relevant effects of diets on growth rate or carcass traits. It was concluded that feeding whole cottonseed at the levels reported herein only had minor effects on fatty acid composition of beef adipose tissues. The effect of breed type on growth, carcass traits and fatty acid composition of longissimus muscle was investigated (chapter IV). Breed types differed significantly in growth traits and carcass yield grades but their carcasses exhibited similar degrees of fatness. Percentages of myristic, stearic and linoleic acids were affected by breed type. However, it was concluded that breed type differences in fatty acid composition of longissimus were nutritionally negligible when compared at similar intramuscular fatness levels. Adipose tissue fatty acid composition was measured in 37 Brahman and 32 Hereford mature cows under controlled environmental and physiological conditions (chapter V). Covariate analyses indicated that, irrespective of fatness, subcutaneous adipose tissue samples from Hereford cows were higher (P <.01) in total saturates and had lower proportions of nutritionally desirable fatty acids than Brahman samples. Finally, fatty acid composition in purebred and reciprocal crosses at different ages or depot sites was examined (chapter VI). Breed of sire, breed of dam and the interaction breed of sire X breed of dam acted independently on fatty acid variables or interacted with sampling periods (age) or depot site. Differences between breeds were more evident in the subcutaneous site. Heterosis had a beneficial effect on the desirable/objectionable fatty acid ratio. The effect of age was clear. As animals became older, mono- and polyunsaturated fatty acids increased while total saturated fatty acids were reduced. There was a consistent effect of depot site (chapters III and IV) on fatty acid profiles of beef adipose tissues. The present study gives encouraging indications that genetics and management can be used to control and manipulate fatty acid profiles in bovine adipose tissues. |
|---|---|
| Item Description: | Typescript (photocopy). Vita. "Major subject: Food Science and Technology." |
| Physical Description: | xiv, 129 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |