Observations On the Characteristics of the Semen in Relation to Fertility in the Bull

Laing, J. A.

doi:10.1017/s0021859600007851

Cited by 28 publications

(8 citation statements)

References 15 publications

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“…In bull and ram semen this correlation is said to be so close that the decrease in pH on incubation can serve as an additional indicator of semen quality (cf. Anderson, 1945;Laing, 1945;Reid, Ward and Salsbury, 1948Z)). As a matter of fact, however, the significance of this method is limited because as the pH value falls, the semen becomes too acid for spermatozoa to maintain their motility and metabolism.…”

Section: Hydrogen Ion Concentration and Buffering Capacitymentioning

confidence: 99%

The biochemistry of semen

Mann¹

1954

246

141

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hen I took up my studies on semen in 1944, on behalf of the Agricultural Research Council, I became painfully aware of the fact that information on the physiology of semen, its chemical aspects in particular, is rather difficult to come by; the older observations and records being hidden away in books and journals not readily accessible in any but the best equipped libraries, and moreover, scattered throughout an exceptionally wide range of publications, which embrace disciplines as far apart as say, agriculture, urology and cytology. Judging from numerous requests for information, received from fellow workers in the field, biochemists, clinicians, zoologists and veterinary officers alike, the absence of a fairly comprehensive and up-to-date treatise on the chemical physiology of semen must have proved a serious handicap to many in their scientific and practical pursuits. Therefore, I accepted gladly the invitation to write this book; having agreed to produce but a 'little book', I have often found it rather irksome to condense the vast mass of data into the allotted space; had it not been for the encouragement and ready help of colleagues-my wife not least among them, the task would have been even more burdensome. Biochemistry of semen is a relatively modern, but rapidly expanding, field of physiology; consequently, many of our present views, particularly as regards the biological significance of various chemical constituents of semen, may have to be revised or modified in the near future. That being so, I like to look upon this book, or at any rate, those parts of it which deal with the newer, still fluid concepts, as something in the nature of an Interim Report, designed to furnish information and to convey ideas emerging from the state of knowledge as available at the time of writing, however imperfect that may be. In presenting the recently acquired evidence, I have tried to render justice to developments in the sphere of mammalian as vi The Biochemistry of Semen well as non-mammalian physiology, selecting examples from species as far apart as man and the sea-urchins, and occasionally, introducing plants as well. I have done my best to distinguish between established fact and tentative hypothesis, and, as far as possible, have refrained from the tendency, currently prevalent among workers in this field, to assign to every newly discovered chemical constituent of semen a major role in the process of fertilization. I wish to acknowledge gratefully the help of those who gave me permission to reproduce plates and figures. In particular 1 wish to extend my thanks to Dr.

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Section: Hydrogen Ion Concentration and Buffering Capacitymentioning

confidence: 99%

The biochemistry of semen

Mann¹

1954

246

141

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“…The V.M.A. tests were carried out in accordance with the method reported by Laing (1957). Antigen was prepared from a strain of V .…”

Section: Methodsmentioning

confidence: 99%

Experimental Vibrio Fetus Infection in Heifers

Newsam

1960

Aust Veterinary J

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“…For other species it can be observed if semen is concentrated by centrifugation. The phenomenon has been well described (Laing 1945;Blom 1946;Rothschild 1949). Its physical basis was studied and discussed by Walton (1952).…”

Section: Introductionmentioning

confidence: 99%

Semen Wastage at a Bovine Artificial Breeding Centre

Wright

1975

Aust Veterinary J

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The consequences of the use of swirl assessment at a bovine artificial breeding centre were studied. Data relating to the amount of semen discarded, fertility of accepted semen, the relationship between discard rates and age of bull and ejaculate number have been presented. The overall differences in fertility between semen with swirl ratings, 5, 6 and 7 were very small. About 50% of all ejaculates collected in the period considered were discarded at the first inspection. The discard rate tended to be greater in young and in older bulls. The discard rate was significantly greater (P less than or greater to 0.001) for second ejaculates. It was considered that a proportion of rejected semen may have been of good fertility. Semen wastage after freezing was low.

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Observations On the Characteristics of the Semen in Relation to Fertility in the Bull

Cited by 28 publications

References 15 publications

The biochemistry of semen

The biochemistry of semen

Experimental Vibrio Fetus Infection in Heifers

Semen Wastage at a Bovine Artificial Breeding Centre

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