Effects of age, genotype and social rank on mating proficiency of beef bulls /
(P<.0004), and F, Gelbvieh x Red Angus bulls had a larger
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (P<.0004), and F, Gelbvieh x Red Angus bulls had a larger a combination of both semen evaluation and a social Angus and Composite genotypes (P<.0053). Results of breeding groups were significantly influenced by bull social bulls respond more rapidly to electroejaculation stimuli than by a 20minute test duration in Composite bulls, while a 30- copulatory proficiency of Santa Gertrudis bulls. Pregnancy difference was observed with the Fl Gelbvieh x Red Angus electroejaculation, 2) a serving capacity test to compare the Experiment 2 indicate that serving capacity may be assessed Experiments were conducted to determine the reproductive genotype effects on semen quality and response to genotypes (P<.003). An age by genotype effect (P<.02) on Gertrudis or Simmental bulls (P<.002). Scrotal circumference Gertrudis, 1/4 Red Angus, 1/4 Gelbvieh) and Santa Gertrudis interaction test to categorize bulls as either dominant or interval to conception (P<.0001) and had a higher pregnancy lower percentage of motile sperm than the Fl Gelbvieh x Red minute serving capacity test is suggested to evaluate needed to ejaculate 1-year-old than 2-year-old bulls (P<.001) older bulls, duration of a serving capacity test can be potential of herd sires by: 1 ) an evaluation of age and pregnancy rate in a single-sire breeding group. profile of copulatory activity between two genotypes and, 3) rank in Experiment 3. Subordinate bulls had a shorter rate than dominant bulls (P<.0001). We conclude that yearling rate, interval to conception and calving date in single-sire reduced for Composite genotypes and social rank can influence requiring fewer electronic impulses than either the Santa scrotal circumference than the Composite (1/2 Santa smaller scrotal circumference than 2-year-old bulls sperm motility was observed for the 1- and 2-year- old bulls. subordinate. In Experiment 1, fewer electronic impulses were The percentages of normal and motile sperm increased from 1 to 2 years of age (P<.0001). Santa Gertrudis bulls had a via electroejaculation. In 3-year-old bulls, a genotype was influenced by age and genotype. One-year-old bulls had a |
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| Item Description: | "Major subject: Animal Science". Vita. |
| Physical Description: | x, 72 leaves : illustrations ; 28 cm. Also available online. |
| Bibliography: | Includes bibliographical references. |