FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W625565510> ?p ?o ?g. }

• W625565510 abstract "Between April 1968 and January 1972, a project was conducted on three properties in Central Queensland (A, B and C) which investigated the reproductive functions of young (16-31 month) beef bulls. The author was first associated with the project in September 1968. The main objective of the study was to study multiple aspects of the reproductive function of the bulls to determine whether variations occurred due to breeds. The secondary objective was to determine whether the main assessment criteria employed (seminal score and libido score) had any predictive value for fertility in young bulls.The bulls used in the project represented 3 breeds and 3 breed crosses. The breed groups and total number of examinations involved were: Brahman cross (Bx) 100; Africander cross (Ax) 93; Shorthorn/Hereford cross (S.H.) 109; Brahman (Brah.) 81; Africander (Afr.) 89 and Hereford (Her.) 230. The terms Brahman and Africander refer to animals which were at least three-quarters pure-bred. The cross-bred animals had been subjected to a similar degree of cross-breeding to each other and were all raised under identical conditions on property A.The protocol was to test groups of young bulls four times over a 12 month period (April/May, August/September, November/December, April/May) with the first test being in April/May when the bulls were about 16 months of age. At each testing period, each bull was to be subjected to a physical examination (with particular reference to the reproductive organs), semen collection by electro-ejaculation (with subsequent assessment) and two five-minute exposures to a libido and mating ability test which had been developed for this project from previous v7ork by H. G. Osborne. Some of the bulls examined on property A were individually mated to groups of females under paddock conditions and their reproductive performance was related to their test results. Where applicable, analysis of results was by least squares methods for multiple classifications with unequal subclass numbers.The physical examination of the bulls employed in the project (Chapter V) provide data on the occurrences and breed differences in various abnormalities of young bulls in Central Queensland. High occurrences of enlarged and firm seminal vesicles were encountered, with the Hereford breed having highest representation in both categories (both P<.01). Possible reasons for this are advanced. Testicular hypoplasia was diagnosed in 2.7 percent of the examinations with the Brahman breed being highly represented (8.6 percent; P<.01). The significance of this finding is discussed and the need for further studies of gonadal development in the Brahman breed in Australia is stressed. Small seminal vesicles were encountered in a similar number of Brahman examinations (8.6 percent; P<.001). other abnormalities detected included; abnormal carriage of the testicles (0.3 percent), enlargement of portion of the epididymis (2.7 percent), preputial ulceration (6.8 percent), preputial abscesses (1.9 percent) and varying degrees of preputial prolapse (0.7 percent).Breed variations occurred in response to electro-ejaculation with a Watson Transtimulator used in conjunction with a bipolar ring electrode probe (Chapter VI) . Overall, failure to collect an assessable ejaculate occurred in 15.0 percent of attempts. Most electro-ejaculation failures occurred in the Africander breed (23.6 percent; P<.05) with the Ax breed group having second highest representation (19.4 percent; n.s.). These two breed groups also showed a higher prevalence of severe reactions to the electric stimulus than the other breeds (32.6 percent; P<.001 and 28.0 percent; P<.01 respectively). Overall, bulls of Bos indicus derivation did not have more electro-ejaculation failures than those of Bos taurus derivation.Considerable differences occurred between breeds in qualitative seminal characteristics (Chapter VII). The Bx breed group was considered to show poorer seminal quality than the other breeds. The data suggest that a seasonal depression in seminal quality occurred during the hottest period of the year (November/December) when daily maximum temperatures are consistently well in excess of 30 C. The data also suggest that total sperm per ejaculate increased with age within the age range of the bulls studied in this project (16-31 months) while the occurrence of distal droplets decreased.In the libido testing program (Chapter VIII), those bulls with an Africander component in their geneaology generally achieved the best results and those with a Brahman component generally achieved the worst. The mating ability results confirmed this relationship. Mean libido score did appear to increase with age within the age range of the bulls studied (16-31 months). There was no indication that libido was depressed during the hottest period of the year. It was concluded that puberty, defined as the functional capability to impregnate females, was deficient or delayed in the Brahman breed in comparison with the other breeds studied. This conclusion was based on the relatively poor performance of this breed in the libido/mating ability tests. This theory is discussed in more detail in Chapter VIII.A total of 56 bulls on which semen and libido scores had been determined were individually mated with groups of females on property A during the project period (Chapter IX). Pregnancy rates differed between breeds (P<.05) confirming information on a larger series of matings conducted on property A from 1954 to 1971 inclusive (Appendix II). The correlation between the semen score and pregnancy rate was r=.13 (n.s.) and between the libido score and pregnancy rate it was .32 (P<.05). These results indicate that libido assessment can contribute to fertility prognosis in young beef bulls destined for natural service." @default.
• W625565510 created "2016-06-24" @default.
• W625565510 creator A5030193054 @default.
• W625565510 date "2014-12-01" @default.
• W625565510 modified "2023-09-24" @default.
• W625565510 title "Studies on aspects of the reproductive function of young beef bulls in Central Queensland" @default.
• W625565510 doi "https://doi.org/10.14264/uql.2014.482" @default.
• W625565510 hasPublicationYear "2014" @default.
• W625565510 type Work @default.
• W625565510 sameAs 625565510 @default.
• W625565510 citedByCount "4" @default.
• W625565510 countsByYear W6255655102013 @default.
• W625565510 countsByYear W6255655102021 @default.
• W625565510 crossrefType "dissertation" @default.
• W625565510 hasAuthorship W625565510A5030193054 @default.
• W625565510 hasConcept C140793950 @default.
• W625565510 hasConcept C144024400 @default.
• W625565510 hasConcept C149923435 @default.
• W625565510 hasConcept C2776482104 @default.
• W625565510 hasConcept C2776521926 @default.
• W625565510 hasConcept C2778093475 @default.
• W625565510 hasConcept C2779984200 @default.
• W625565510 hasConcept C2780505807 @default.
• W625565510 hasConcept C2908647359 @default.
• W625565510 hasConcept C42972112 @default.
• W625565510 hasConcept C518429986 @default.
• W625565510 hasConcept C54355233 @default.
• W625565510 hasConcept C71924100 @default.
• W625565510 hasConcept C86803240 @default.
• W625565510 hasConceptScore W625565510C140793950 @default.
• W625565510 hasConceptScore W625565510C144024400 @default.
• W625565510 hasConceptScore W625565510C149923435 @default.
• W625565510 hasConceptScore W625565510C2776482104 @default.
• W625565510 hasConceptScore W625565510C2776521926 @default.
• W625565510 hasConceptScore W625565510C2778093475 @default.
• W625565510 hasConceptScore W625565510C2779984200 @default.
• W625565510 hasConceptScore W625565510C2780505807 @default.
• W625565510 hasConceptScore W625565510C2908647359 @default.
• W625565510 hasConceptScore W625565510C42972112 @default.
• W625565510 hasConceptScore W625565510C518429986 @default.
• W625565510 hasConceptScore W625565510C54355233 @default.
• W625565510 hasConceptScore W625565510C71924100 @default.
• W625565510 hasConceptScore W625565510C86803240 @default.
• W625565510 hasLocation W6255655101 @default.
• W625565510 hasOpenAccess W625565510 @default.
• W625565510 hasPrimaryLocation W6255655101 @default.
• W625565510 hasRelatedWork W1480398906 @default.
• W625565510 hasRelatedWork W1971649197 @default.
• W625565510 hasRelatedWork W1977880476 @default.
• W625565510 hasRelatedWork W1986366644 @default.
• W625565510 hasRelatedWork W2000347613 @default.
• W625565510 hasRelatedWork W2014381832 @default.
• W625565510 hasRelatedWork W2019715613 @default.
• W625565510 hasRelatedWork W2025463171 @default.
• W625565510 hasRelatedWork W2027516672 @default.
• W625565510 hasRelatedWork W2028834079 @default.
• W625565510 hasRelatedWork W2031929640 @default.
• W625565510 hasRelatedWork W2043618405 @default.
• W625565510 hasRelatedWork W2048978947 @default.
• W625565510 hasRelatedWork W2111402714 @default.
• W625565510 hasRelatedWork W2134056678 @default.
• W625565510 hasRelatedWork W2165024788 @default.
• W625565510 hasRelatedWork W2398498408 @default.
• W625565510 hasRelatedWork W2410387981 @default.
• W625565510 hasRelatedWork W3186464971 @default.
• W625565510 hasRelatedWork W75711963 @default.
• W625565510 isParatext "false" @default.
• W625565510 isRetracted "false" @default.
• W625565510 magId "625565510" @default.
• W625565510 workType "dissertation" @default.