Semen and Testis Characteristics in Young Yorkshire and Lacombe Boars

Swierstra, E. E.; Rahnefeld, G. W.

doi:10.2527/jas1967.261149x

Cited by 24 publications

(15 citation statements)

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“…The ratio of left to right testicular weight agrees with the results obtained with German Landrace boars by Egbunike, Holtz, Endell & Smidt (1975) and with Yorkshire and Lacombe boars by Swierstra & Rahnefeld (1967) and Swierstra (1968). The average paired testes weight was much lower than that reported by Swierstra (1968) for even younger boars in Canada (Table 2).…”

Section: Resultssupporting

confidence: 89%

Testicular and epididymal sperm reserves of crossbred European boars raised and maintained in the humid tropics

Ke¹,

Elemo²

1978

Reproduction

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Summary. The testicular and epididymal sperm reserves of 32 adult crossbred European boars (mean age 17\m=.\4months, range 15\p=n-\21months) raised and maintained in Ibadan, Nigeria were 43\m=.\77\m=x\109 and 207\m=.\20\m=x\109 cells respectively, and were correlated (P< 0\m=.\01)with age and organ weight. The distribution of spermatozoa in the epididymis was 16, 6 and 78% in the caput, corpus and cauda epididymidis respectively. The testicular and epididymal sperm reserves were correlated (P< 0\m=.\05), suggesting that sperm production and storage are associated. All the values studied were comparable with those reported for boars kept in temperate climates.

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Section: Resultssupporting

confidence: 89%

Testicular and epididymal sperm reserves of crossbred European boars raised and maintained in the humid tropics

Ke¹,

Elemo²

1978

Reproduction

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“…The boars had free access to water and were hand-fed 1-36 kg of pelleted ration (16% protein) twice daily. Using a dummy sow as teaser, semen was collected by artificial vagina (Swierstra & Rahnefeld, 1967), and the sperm concentration was determined in the gel-free fraction of the ejaculate by optical density (Young, Foote, Turkheimer & Hafs, 1960). The total number of spermatozoa per ejaculate was calculated, taking into account sperm losses in the collection equipment and gelatinous fraction of the ejaculate.…”

Section: Methodsmentioning

confidence: 99%

“…The total number of spermatozoa per ejaculate was calculated, taking into account sperm losses in the collection equipment and gelatinous fraction of the ejaculate. Swierstra & Rahnefeld (1967) determined that these losses equalled 3-28% of the number of spermatozoa present in the collection bottle.…”

Section: Methodsmentioning

confidence: 99%

Sperm Production of Boars as Measured From Epididymal Sperm Reserves and Quantitative Testicular Histology

Swierstra¹

1971

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“…Swierstra and Rahnefeld (16) have shown that young boars difiered significantly (P < 0.01) with respect to total volume, total sperm per ejaculate and motile sperm per ejaculate. Genetic lethals are not considered a likely cause of the sire difierence on litter size, because every boar was mated to two or more females.…”

Section: Methodsmentioning

confidence: 99%

Influence of the Sire on Litter Size in Swine

Rahnefeld¹,

Swierstra²

1970

Can. J. Anim. Sci.

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The direct effect of the sire on the total num-and Lacombe populations there' was a -signi6gr.f pigr-boi" fi""t"Aing-iiittUo.o, exclud-ficant sire efiect on the total number of p-igs ing necioiic), ttre iumbeiSoi"itive, and the born, the_number born alive, and the number ft"-b;i *;;;"4 *"r ii"OOO in 277 Yorkshire weaned. Intra-sire correlations (repeatability) and 356 Lacombe litters iireO by 131 York-for total number born, number born alive, itriie-ana t6j Lacombe boars. Af mating, the and number weaned were 0.174 -f 0.082 uu-"iug" ugeot-ttte maies was 250 -r lddays (P < 0.95)r-0.!63 :-q'0.81--(P-<. 0'05)' and oT thifemales 248 -+-18 days. The Yori<-0.194 -{. 0.081-(4"_< 0.01) in Yorkshires and shire andLaccimbe sires pioduc6d an averase 0.242 -r 0'070 (P < 0'01)'-0'208-t g'gz! ;ft.{l;;d,t.is-titi"tt, ietpeitiuetv. For tfie (P < 0.01), a-ni 0'167 t o.o72 (P-< 0'05) Yorkshire litters the ioiaf'"omUJr of pigs in Lacombes. Linear regression coefficients of born, number born alive, and number *eanJd litter size (num-ber born, number born alive, were' 9.43, 9.07, and 8.i5, respectively. Cor-number wearled) on number of females setresponding averages for tire Gcombes were tled by the sire are presented' 9.09, 8.38, znd 6.97.In both the Yorkshire

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Semen and Testis Characteristics in Young Yorkshire and Lacombe Boars

Cited by 24 publications

References 0 publications

Testicular and epididymal sperm reserves of crossbred European boars raised and maintained in the humid tropics

Testicular and epididymal sperm reserves of crossbred European boars raised and maintained in the humid tropics

Sperm Production of Boars as Measured From Epididymal Sperm Reserves and Quantitative Testicular Histology

Influence of the Sire on Litter Size in Swine

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