Heterosis Estimates for Measures of Reproductive Traits in Crossbred Boars

Neely, J. D.; Johnson, Blake; Robison, O. W.

doi:10.2527/jas1980.5151070x

Cited by 22 publications

(13 citation statements)

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“…breeding performance and the possibility of their longer use as compared to the pure breed animals. It is confirmed by the results of many authors' studies (Czarnecki, et al, 1999;Fent, et al, 1980;Kapelański, 1995;Knap, 1987;Michalska, 1996;Michalska, et al, 2004Michalska, et al, , 2010Milewska, 2007;Milewska and Falkowski, 2001;Neely and Robison, 1983;Neely, et al, 1980;Nowachowicz, et al, 2009;RóŜycki, 1995). In a Polish pig breeding and keeping the boars of breeds: Hampshire, Duroc, Pietrain and two-breed crossbreds came from the reciprocal crossing determine the paternal component and are performance tested.…”

Section: Introductionsupporting

confidence: 72%

The relationships between the performance test results of young crossbred boars

Nowachowicz¹,

Michalska²,

Bucek³

et al. 2012

JCEA

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The relationships between the most important results of performance test of 3.876 young crossbred boars, expressed as calculated correlation coefficients were determined. The animals came from 6 crossing variants: Hampshire x Belgian Landrace (H x BL), Hampshire x Duroc (H x D), Hampshire x Pietrain (H x P), Duroc x Pietrain (D x P), Pietrain x Hampshire (P x H) and Pietrain x Duroc (P x D). Young crossbred boars were performance tested in years [2004][2005][2006][2007][2008] in Poland in Bydgoszcz Breeding Region. The traits taken into account were: age and body weight on the test day, daily gain of body weight standardized on 180 th day of life, backfat thickness in P 2 and P 4 points, height of loin eye in P 4 point, lean meat content and the performance test selection index. In a total results summary from years 2004-2008 in tested groups of young crossbred boars (except H x BL) negative and in most cases statistically high significant correlations were proved between the growth rate and standardized backfat thickness in P 2 and P 4 points and in young crossbred boars came from 3 following crossing variants: H x BL, P x H, P x D negative and statistically high significant correlation coefficients were observed between the daily gain of body weight and standardized lean meat content, which may show the unfavourable impact of high growth rate on meat content.

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Section: Introductionsupporting

confidence: 72%

The relationships between the performance test results of young crossbred boars

Nowachowicz¹,

Michalska²,

Bucek³

et al. 2012

JCEA

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“…These values are somewhat less than the lower plateaus of number of sperm in the semen ( Figure 5). High correlations of testicular size with sperm output have been found in swine (Wilson et al, 1977;Egbunike and Elemo, 1978;Neely et al, 1980;Fent et al, 1983), sheep (Knight 1977(Knight , 1984, and cattle (Hahn et al, 1969;Almquist et al, 1976;Coulter et al, 1976;Neely et al, 1982). None of the studies compared lines that differed in testis size due to selection.…”

Section: Discussionmentioning

confidence: 97%

“…Testicular size in boars is highly heritable (Legault et al, 1980;Neely et al, 1980;Young et al, 1986;Johnson et al, 1994). Testis size and weight are correlated with daily sperm production and total sperm reserves (Fent et al, 1983;Young et al, 1986;Lubritz et al, 1991;Rathje et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

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

Huang

Johnson

1996

Journal of Animal Science

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ABSTRACT:The objective of this study was to evaluate the effects of selection for increased size of testes on semen and testis characteristics. Boars from a line selected for increased size of testes at 150 d of age (TS, n = 25) and a randomly selected control line (C, n = 18) were used. Semen was collected three times per week for 3 wk (TRT1) then daily for 3 wk (TRT2) beginning when boar age averaged 276 d. It was followed by a 4-wk period of one collection per week and then the TRT1-TRT2 sequence was repeated. After 64 collections, boars were castrated and testes were evaluated for sperm numbers. Volume of semen, percentage of motile sperm cells, and percentage of abnormal cells in the semen did not differ ( P > .05) between lines. Concentration of sperm cells in the semen was greater for TS boars at TRT 1 (35.0 million cells/mL, P < .10) and TRT 2 (29.5 million cells/mL, P < .01). Number of sperm cells per ejaculate was greater for TS boars (6.1 and 4.3 billion cells for TRT 1 and TRT 2, respectively; P < .05). Percentage of abnormal cells was less ( P < .05) for boars at the younger ages. Concentration of sperm cells was 16 to 18 million cells/mL semen greater ( P < .05) at the older ages. Significant differences in the shapes of the response curves with increasing collection number across lines and ages were found. These differences were small and not considered to be important. Line differences in testicular and epididymal sperm numbers and in daily sperm production were consistent with differences in semen traits. Repeatabilities of semen traits were between .16 and .74. Selection for increased size of testes can be used to improve the reproductive capacity of boars used for artificial insemination.

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“…If so, the reduced advantage for the entire breeding season is not surprising because the purebred boars would have matured during the 8 wk of breeding. More advanced sexual maturity (measured by testis weight and sperm numbers) in crossbred boars has been demonstrated by several studies (Hauser et al, 1952;Wilson et al, 1977;Fent, 1980;Neely et al, 1980 aThere were 15 to 18 boars in each breed group. bNumber of litters.…”

Section: Duroc-spotted Boarsmentioning

confidence: 99%

“…The advantage of a crossbred female is clear, but there has been less research concerning the use of crossbred boars. Studies on young crossbred boars have generally shown an advantage in testis weight, mating behavior and conception rate (Hauser et al, 1952;Lishman et al, 1975;Wilson et al, 1977;Conlon and Kennedy, 1978;Neely et al, 1980), but more information is needed. There is also less information on the performance of the Landrace and Spotted breeds than for Durocs, Yorkshires or Hampshires.…”

Section: Introductionmentioning

confidence: 99%

Reproductive Performance for Four Breeds of Swine: Crossbred Females and Purebred and Crossbred Boars

Buchanan

Johnson

1984

Journal of Animal Science

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SummaryMatings and litters were studied involving all three-breed crosses (sired by purebred boars) and four-breed crosses (sired by crossbred boars) from the Duroc, Yorkshire, Landrace and Spotted breeds. There were 764 female mating records and 161 boars used over five sequential breeding seasons. A sample of pregnant gilts was slaughtered each season and the remainder were allowed to carry their litters to term so that 493 litters resulted. Crossbred and purebred boars and crossbred females were evaluated for their contributions to conception rate (first service and over an 8-wk breeding season), number of services/ conception, litter size and weight at birth, 21 and 42 d and survival rate to 21 and 42 d. Crossbred boars had a 17.9% higher first service conception rate, a 5.3% higher breeding season conception rate and performed 9 11 fewer services/conception compared with purebred boars. There were no significant differences among the boar breeding groups for litter size, weight or survival rate. The six crossbred female groups (reciprocal crosses were combined) did not differ significantly in conception rate or number of services/ conception. There were significant differences in litter weight born and differences that approached significance (P<.10) for litter size at 42 d and litter weight at 21 d. Yorkshire-Landrace females had the largest litters at birth, 21 and 42 d and the heaviest litters at 21 and 42 d. The smallest litters at 21 and 42 d were from Yorkshire-Spotted females, and they also had the lighest weight litters at all three stages 9

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Heterosis Estimates for Measures of Reproductive Traits in Crossbred Boars

Cited by 22 publications

References 0 publications

The relationships between the performance test results of young crossbred boars

The relationships between the performance test results of young crossbred boars

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

Reproductive Performance for Four Breeds of Swine: Crossbred Females and Purebred and Crossbred Boars

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