자료유형  

 학위논문

Control Number  

0016935509

International Standard Book Number  

9798380360463

Dewey Decimal Classification Number  

630

Main Entry-Personal Name  

Bauer, Lance William.

Publication, Distribution, etc. (Imprint  

[S.l.] : Texas A&M University., 2022

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2022

Physical Description  

1 online resource(60 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-03, Section: B.

General Note  

Advisor: Sanders, James;Riley, David.

Dissertation Note  

Thesis (Ph.D.)--Texas A&M University, 2022.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약The goal of this study was to assess the correspondence between feed efficiency and maternal traits, feed efficiency and carcass traits, and carcass traits and maternal traits. Two sets of data from Beefmaster Breeders United (BBU) were used. Efficiency traits included residual feed intake (RFI), average daily gain (ADG), dry matter intake (DMI) and gain to feed ratio (G:F). Ultrasound carcass traits included longissimus area (LA), intramuscular fat (IMF), and rib fat. Maternal traits included age at first calving (AFC), calving interval (CI), and disposal age. The first set of data included females that had been tested for feed efficiency (n = 277). The second set had ultrasound carcass measures, calving records, and records of disposal (n = 3,756 cows). There was a negative regression of AFC on RFI (-7.04 ± 3.36; P 0.12). Heifers in the upper quartiles had rib fat estimates of 0.7 ± 0.05 cm and differed from the very low quartile (0.60 ± 0.05 cm; P 0.05). The regression coefficients (P 0.001) of IMF on RFI and rib fat were 0.20 ± 0.06 and 0.067 ± 0.017, respectively. The regression coefficients (P 0.01) of IMF, rib fat, and LA on DMI were 0.12 + 0.04, 0.079 ± 0.011, and 2.60 ± 0.35, respectively. The regression of LA on ADG was 4.47 ± 1.76 (P 0.05). The regressions (P 0.05) of IMF and rib fat on G:F were -3.66 ± 1.53, and -1.85 ± 0.44, respectively. Heritability estimates ranged from 0.2 ± 0.03 to 0.38 ± 0.03 for IMF, rib fat, and LA. Estimates of heritability for maternal traits were less than 0.1. Estimates of genetic correlations for carcass traits were greater than 0.23, and for AFC and CI was -0.90 ± 0.15. The regression coefficients (P 0.05) of AFC on IMF and LA were -2.58 ± 1.06 and -0.50 ± 0.11). Minimal correspondence between feed efficiency, carcass, and fertility was detected in this work, and results in Beefmaster cattle appearing to be consistent with other breeds.

Subject Added Entry-Topical Term  

Agriculture.

Subject Added Entry-Topical Term  

Animal sciences.

Index Term-Uncontrolled  

Cattle

Index Term-Uncontrolled  

Maternal traits

Index Term-Uncontrolled  

Feed efficiency

Index Term-Uncontrolled  

Ultrasound carcass

Index Term-Uncontrolled  

Beefmaster

Added Entry-Corporate Name  

Texas A&M University Animal Science

Host Item Entry  

Dissertations Abstracts International. 85-03B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:641090