Some Observations on the Semen Production of the Male Fowl

Burrows, W. H.; Titus, Harry W.

doi:10.3382/ps.0180008

Cited by 35 publications

(13 citation statements)

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“…The lack of correlation between age of the males and either semen volume or sperm count per ejaculate agrees with the results obtained in fowl (Penquite et al 1930;Burrows and Titus 1939). In fact, some yearlings produced volumes of semen and sperm numbers that equalled or surpassed those of some of the older birds.…”

Section: Discussionsupporting

confidence: 88%

Semen production of the American kestrel

Bird¹,

Laguë²

1977

Can. J. Zool.

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BIRD, D. M . , and P. C. LAGUE. 1977. Semen production of the American kestrel. Can. J. Zool. 55: 1351-1358.In 1975, semen was collected by massage from 18 randomly selected captive male American kestrels (Falco sparverius). The period of semen production extended for 103 days, beginning on March 19, while the mean duration of semen production was 73.6 days. Under natural light, semen production began at 123 h of daily light, peaked about 1% h, and decline considerably around June 21 at 153 h. Weather factors, i.e., temperature, barometric pressure, did not significantly (P > 0.05) affect semen collections or quality.The following means were calculated: semen volume, 12 pl; sperm concentration, 31 OOO/mm3; sperm count per ejaculate, 416 000; motility score, 78%; contamination with epithelial debris and urates, 67%; and semen colour, very pale to pale amber.The following significant (P < 0.05) correlations were found: body weight with semen volume (0.48) and sperm count per ejaculate (0.54); egg fertility with sperm count per ejaculate (0.65); semen volume with sperm count per ejaculate (0.84) and sperm motility (0.54); sperm count per ejaculate with sperm concentration (0.78); and sperm motility with sperm concentration (0.59) and sperm count per ejaculate (0.75). BIRD, D. M., et P. C. LAGUE. 1977. Semen production of the American kestrel. Can. J. Zool. 55: 1351-1358. C'est par une methode de massage que nous avons recueilli, en 1975, la semence de 18 miles choisis au hasard au sein d'une colonie en captivite. La production de semence s'echelonna sur 103 jours et dura 73.6 jours en moyenne, et ceci sous illumination naturelle. Les premiers ejaculats ont CtC recueilles le 19 mars sous 123 h de lumiere par jour, la production de semence atteignirent un sommet sous 13) h de lumitre parjour et se mit a diminuer, rapidement vers le 21 juin, sous 153 h de lumitre. Le climat, i.e., temperature, pression atmospherique, n'ont affecte d'une f a~o n significative (P > 0.05) ni les recoltes ni la qualite de la semence. Voici les moyennes calculCes sur les ejaculats: volume, 12 p1; concentration et nombre de spermatozoi'des, 31 OOO/mm3, et 416000, parametre de motilite, 78%, contamination par debris epitheliaux et acide urique, 67%, la couleur va de tres pile a orange pile. Les correlations suivantes se sont avertes significatives ( P < 0.05): poids du mile avec volume (0.48) et nombre de spermatozoi'des par kjaculat (0.54), fertilite avec nombre de spermatozoi'des par ejaculat (0.65), volume de I'ejaculat avec nombre de spermatozoldes par ejaculat (0.84) et motilite (0.54), nombre de spermatozoi'des par ejaculat avec concentration (0.78). motiliti avec concentration (0.59) et nombre de spermatozoi'des par kjaculat (0.75).

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Section: Discussionsupporting

confidence: 88%

Semen production of the American kestrel

Bird¹,

Laguë²

1977

Can. J. Zool.

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“…The average testes mass of the cockerels from line S was accordingly lower than that of the cockerels from the control line (Table 1). Testes size in birds is directly correlated both with sperm production and the males' ability to insem-C The Genetical Society of Great Britain, Heredity, 75, 518-529. mate the females successfully (Burrows & Titus, 1939;Martin & Dziuk, 1977;Brillard & de Reviers, 1985) and with male territoriality (Tsuij et al, 1992).…”

Section: Discussionmentioning

confidence: 99%

Artificial selection for increased comb size and its effects on other sexual characters and viability in Gallus domesticus (the domestic chicken)

et al. 1995

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The expression of secondary ornaments is often positively correlated with the bearer's condition. So far no study has reported on consequences of directional selection on male sexual ornaments in birds, i.e. it is unknown to what extent male sexual traits are genetically correlated and whether selection for secondary ornaments affects viability. In this study we estimate phenotypic and genotypic parameters of three male sexual traits, namely comb size, spur length and testes mass, by using two different lines of domestic chickens (Gallus domesticus). One of the two lines had been artificially selected for large comb size during nine generations whereas the other line was a randomly mated control line. As a result of the selection, male comb size was almost doubled. Data from the selection line indicate that comb size was negatively genetically correlated with testes mass and spur length. The cockerels from the selection line had accordingly lighter testes and shorter spurs than cockerels from the control line. A simple mate choice experiment with females and males from both lines indicated that preferred males had a larger joint expression of comb size and spur length than nonpreferred males. Data from three different selection lines, all with enlarged comb size, clearly reveal a negative effect of comb size on male viability.

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“…Males with large badges will probably have larger ejaculates than other males because of more sperm producing tissue (e.g. Burrows and Titus 1939). Fertilization chances in sperm competition situations will, therefore, probably favour large-badged males.…”

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confidence: 97%