Effect of selection for size of testes in boars on semen and testis traits.

Huang, Ying-Tsorn; Johnson, R. K.

doi:10.2527/1996.744750x

Cited by 38 publications

(17 citation statements)

References 21 publications

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“…The results of the present work show that frequent ejaculate collection, even over a shorter period of time than in the case of Bonet et al (1991) and Strzeżek et al (1995) studies, also leads to a considerable decrease in sperm motility. Different results were obtained by Huang and Johnson (1996) who found that, even over the period of three weeks, day-to-day semen collection from Landrace and Large White hybrids made it possible to obtain ejaculates with good sperm motility, at the level of 72%.…”

Section: MMmentioning

confidence: 90%

Physical characteristics of ejaculates produced by insemination boars depending on the interval between successive ejaculate collections

Bajena¹,

Kondracki²,

Iwanina³

et al. 2016

JCEA

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The ejaculate characteristics of Polish Landrace boars showed a significant correlation with the intervals between the successive ejaculate collections. The effect of insemination use intensity was however varied. Rising frequency of ejaculate collection led to a systematic and fairly even fall in ejaculate volume. Ejaculate sperm concentration remained at a relatively high level when ejaculates were collected with a frequency of 7 to 3 days but further shortening of the interval between the successive collections led to a drastic decrease in sperm concentration. An increase in ejaculate collection frequency to every four and fewer days resulted in a significant decrease in the number of spermatozoa present in the produced ejaculates and a concomitant decrease in the number of insemination doses prepared from these ejaculates, with an escalation of such changes. się na relatywnie wysokim poziomie przy pobieraniu ejakulatów z częstotliwością co 3-7 dni, ale dalsze skracanie czasu między kolejnymi pobraniami skutkuje drastycznym zmniejszaniem koncentracji plemników. Zwiększanie częstotliwości pobierania ejakulatu do co 4 i mniejszej liczby dni skutkuje istotnym zmniejszaniem liczby plemników w wydalanych ejakulatach i adekwatnym zmniejszaniem liczby porcji inseminacyjnych wytwarzanych z tych ejakulatów, przy czym następuje eskalacja tych zmian.Słowa kluczowe: częstotliwość ejakulacji, jakość ejakulatu, knur Detailed abstract Badania przeprowadzono na materiale 126 ejakulatów, pobranych od 6 knurów rasy polskiej białej zwisłouchej (po 21 ejakulatów od każdego knura). Ejakulaty pobierano zachowując stałe i regularne odstępy między kolejnymi pobraniami. Od każdego knura pobrano po 3 ejakulaty w odstępach 7-dniowych oraz po 3 ejakulaty w odstępach 6, 5, 4, 3, 2, i 1-dniowych. Każdy ejakulat poddano ocenie ustalając następujące cechy fizyczne: objętość ejakulatu, koncentrację plemników, odsetek plemników o ruchu postępowym, ogólną liczbę plemników w ejakulacie i liczbę dawek inseminacyjnych uzyskanych z jednego ejakulatu. Zebrane dane pogrupowano według kryterium odstępu między kolejnymi pobraniami ejakulatu.Wykazano, że cechy fizyczne ejakulatu zależą od odstępu czasu między kolejnymi pobraniami ejakulatu. Wpływ intensywności inseminacyjnego użytkowania jest jednak zróżnicowany. W przypadku objętości ejakulatu zwiększanie częstotliwości pobierania ejakulatów skutkuje systematycznym i w miarę równomiernym zmniejszaniem objętości ejakulatów. Koncentracja plemników w ejakulacie utrzymuje się na relatywnie wysokim poziomie (powyżej 360 x 10 3. mm -3) przy pobieraniu ejakulatów z częstotliwością co 3-7 dni, ale dalsze skracanie czasu między kolejnymi pobraniami skutkuje drastycznym zmniejszaniem koncentracji plemników w ejakulacie. Ejakulaty o bardzo dużej liczbie plemników (powyżej 90 mld) pozyskuje się przy częstotliwości ejakulacji mniejszej niż co 4 dni. Zwiększanie częstotliwości pobierania ejakulatu do 4 i mniejszej liczby dni skutkuje istotnym zmniejszaniem liczby plemników w wydalanych ejakulatach i adekwat...

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Section: MMmentioning

confidence: 90%

Physical characteristics of ejaculates produced by insemination boars depending on the interval between successive ejaculate collections

Bajena¹,

Kondracki²,

Iwanina³

et al. 2016

JCEA

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“…According to Corcuera et al (2002) boars were probably quite comfortable at 24°C, but if that temperature was coupled with a high stocking rate, high humidity and a high level of ammonia, they would not be comfortable. Huang and Johnson (1996) and Šerniene et al (2002) reported an increase in the percentage of abnormal spermatozoa with age and Clark et al (2003) found a dramatic increase in the average total number of spermatozoa between boars of 8-10 months and up to 14 months of age followed by constancy in this trait after 14 months of age. All these findings are in good agreement with our results.…”

Section: Seasonal Effectsmentioning

confidence: 98%

Effects in genetic evaluation for semen traits in Czech Large White and Czech Landrace boars

Wolf¹,

Smital²

2009

CZECH J ANIM SCI

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Artificial insemination (AI) has become an important procedure in the global pig industry. Compared with natural service, artificial insemination allows the greater use of genetically superior sires (Oh et al., 2006). Selection practices for AI boars are universally based on the genetic evaluations for economically important traits (Robinson and Buhr, 2005). For example, boars of dam breeds kept in the Czech Republic are mainly selected for average daily gain from birth till the end of the performance test, lean meat content at the end of the test and number of piglets born alive . However, no AI centre can restrict itself to the selection for production and female reproduction traits only, it must also consider factors that enhance the efficiency of the centre such as boar conformation and temperament and sperm quantity and quality. Semen volume, sperm concentration and gross sperm morphology are semen traits that affect the profitability of an AI centre (Robinson and Buhr, 2005).It has been shown that semen traits are heritable traits with heritabilities in the same order of magnitude or higher than those for litter size traits (Rothschild, 1996;Grandjot et al., 1997;Smital et al., 2005;Oh et al., 2006;Wolf, 2009). Therefore, genetic evaluation of semen traits and selection for these traits are possible. On this basis, an animal model was developed and put into practical use for the genetic evaluation of semen traits of pig dam breeds kept in the Czech Republic. The genetic evaluation is based on a large data set and includes all AI boars of both dam breeds. The objective of the present investigation is to present and discuss the effects of the individual fixed factors in the animal model for semen traits. Fixed effects were estimated from a four-trait animal model for semen volume, sperm concentration, motility and percentage of abnormal spermatozoa and from single-trait animal models for the total number of spermatozoa and the number of functional spermatozoa. Both the total number of spermatozoa and the number of functional spermatozoa were highest in winter and lowest in summer. Boar's age had a strong influence on semen volume, the total number and the functional number of spermatozoa; these traits increased especially in the first phase. The percentage of abnormal spermatozoa also increased with age. An interval between successive collections of 7 to 10 days yielded the best values for all semen traits. As semen traits are of direct economic importance for AI centres, it can be expected that the estimation of breeding value for semen traits will become important and that AI centres will choose among top boars for production and female reproduction traits the boars with better semen production.

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“…Sperm production in boars correlates positively with testicular size [1,2]. Moreover, number of Sertoli cells in other species establishes testicular size and determines spermproducing capacity [3][4][5][6].…”

Section: Introductionmentioning

confidence: 96%

Interrelationships of Porcine X and Y Chromosomes with Pituitary Gonadotropins and Testicular Size1

Ford

Wise

Lunstra

et al. 2001

Biology of Reproduction

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Endocrine and testicular responses to unilateral castration on 1, 10, 56, or 112 days of age were characterized in 132 Chinese Meishan (MS) x White composite (WC) crossbred boars in which testicular size associates with a quantitative trait locus (QTL) on X chromosome. At 220 days of age, testicles of boars unilaterally castrated on Day 1 or 10 weighed more and had greater total daily sperm production (DSP) than one testicle of bilaterally intact boars (P < 0.05); compensation did not double these two responses. Boars with MS alleles at the X chromosome QTL had smaller testicles, darker colored parenchyma, and lower total DSP than boars with WC alleles (P < 0.05). The MS alleles engendered greater (P < 0.05) plasma FSH and LH during puberty than WC alleles. Plasma FSH increased (P < 0.05) within 48 h of unilateral castration on Days 1, 10, and 56. Subsequent increases occurred earlier during puberty (P < 0.05) after unilateral castration at younger ages than after unilateral castration at older ages. Pubertal increases in plasma FSH and LH were greater (P < 0.05) in boars with MS alleles than in those with WC alleles for the X chromosome QTL. Breed of Y chromosome had no effect on testicular traits, FSH, testosterone, or estrone. For LH, boars with an MS Y chromosome had greater (P < 0.01) plasma LH across all ages than boars with a WC Y chromosome. We conclude that a gene or groups of genes that reside on the porcine X chromosome regulate testicular development and pubertal gonadotropin concentrations.

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Effect of selection for size of testes in boars on semen and testis traits.

Cited by 38 publications

References 21 publications

Physical characteristics of ejaculates produced by insemination boars depending on the interval between successive ejaculate collections

Physical characteristics of ejaculates produced by insemination boars depending on the interval between successive ejaculate collections

Effects in genetic evaluation for semen traits in Czech Large White and Czech Landrace boars

Interrelationships of Porcine X and Y Chromosomes with Pituitary Gonadotropins and Testicular Size1

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