Inheritance of multiple births in cattle

Syrstad, Ola

doi:10.1016/0301-6226(84)90049-6

Cited by 16 publications

(14 citation statements)

References 5 publications

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“…One interpretation from a twin-selection experiment in Nebraska (Gregory et al 1997), which is also consistent with Norwegian population data reported by Syrstad (1984), is that the heritability for TCR may increase with the mean. It would thus be of interest to estimate heritabilities for TCR from herds with above-average means for TCR.…”

Section: Introductionsupporting

confidence: 81%

“…Maijala & Syvajarvi (1977) summarised nine published estimates of heritability (0.028 + 0.0004), and obtained three further values for Finnish cattle (with a combined estimate from the three, weighted by the reciprocal of the sampling variances, being 0.0274 + 0.0015). Syrstad (1984) analysed Norwegian calving records (864 sires with at least 100 daughter-calvings each), and reported means for TCR which increased with parity, averaging 0.46, 1.64, 2.31, 3.11, and 3.57%, for first to fifth parities, respectively, with corresponding heritability estimates of 0.006 + 0.001, 0.021 + 0.002, 0.041 + 0.003, 0.036 + 0.004, and 0.046 + 0.006, respectively. Ron et al (1990) obtained heritability estimates of 0.022 and 0.101 from linear and threshold models of TCR from Israeli Holstein data, with a genetic correlation of 0.98 between the two types of estimates.…”

Section: Research Herd Averagesmentioning

confidence: 99%

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Genetic variation in twin calving incidence in herds with a high phenotypic mean

Morris

Wheeler

2002

New Zealand Journal of Agricultural Research

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concluded, from the five high twinning-rate private herds selected in this study, that they had a higher heritability (average value 0.061 ± 0.010) than in published studies from industry data in other countries (average value from 13 studies, 0.027).Keywords cattle; twins; genetics; heritability Abstract Twin calving data were analysed from five private New Zealand dairy and beef cattle herds, and from the Ruakura experimental twinresearch herd founded from industry cows screened-in on their twin calving history. The objective of the study was to estimate the heritability of twin calving rate in herds with a high phenotypic mean for non-identical twin calving. The annual twin calving rate of the private herds averaged 3.36% overall, based on a total of 17 474 calving records. On average, there were 13% of cows from the selected herds with at least one twin calving in their lifetime. Heritabilities were estimated using restricted maximum likelihood (REML) procedures, with the value for annual twin calving rate for the five herds averaging 0.061 ± 0.010 (individual estimates ranging from 0.016 to 0.090), while estimates for the lifetime incidence of at least one twin calving averaged 0.16 ± 0.029 (range 0.14-0.19). The Ruakura herd had a mean annual twin calving rate over all years (1985)(1986)(1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000) of 11.2%, and in recent years (1998-2000) of 13.3%. One of the most elite cow-families in the herd (12 cows spanning five generations since the foundation cow) had an annual twin calving rate averaging 31% (seven of the cows producing at least one twin set in their lifetime), while another family of seven cows included three sets of 3-times twinning cows. Heritabilities of annual and lifetime twin calving in the Ruakura herd (cows born in 1983-1998) were 0.081 ± 0.031 and 0.25 ± 0.07, respectively. It is A01023

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Section: Introductionsupporting

confidence: 81%

Section: Research Herd Averagesmentioning

confidence: 99%

Genetic variation in twin calving incidence in herds with a high phenotypic mean

Morris

Wheeler

2002

New Zealand Journal of Agricultural Research

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“…peaks were recorded in late 1950s and early 1980s. Fluctuations of average annual genetic effects were observed in studies on twinning in cattle (Sysard 1984;Karlsen et al 2000). This could be an effect of introducing certain stallions to the population.…”

Section: Twinning In Thoroughbred Horsesmentioning

confidence: 99%

Genetic and permanent environmental variability of twinning in Thoroughbred horses estimated via three threshold models

Wolc¹,

Bresińska²,

Szwaczkowski³

2006

J Animal Breeding Genetics

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Twinning is a serious problem in Thoroughbred horses, as most of the multiple pregnancies are miscarried and live foals present lower performance values. The aim of this study was to estimate the heritability and repeatability of twinning in Thoroughbred horses. A total of 12648 pregnancies of 2033 Thoroughbred mares born between 1929 and 1994 in 11 studs were included. The analysis was performed by the use of AI-REML algorithm under three threshold animal models. The first model included effects of stud, mare's birth period and interaction between them as fixed. The second model included the interaction between the stud and mare's birth period as random, whereas in the third model stud effects were also treated as random. The models were compared based on the deviances. Phenotypic and genetic trends were evaluated as well. The twinning rate was 3.5%. The study involved 443 twins and two triplets. Heritability estimates varied from 0.24 (model III) to 0.29 (model I), whereas repeatability estimates ranged from 0.33 (model I) to 0.34 (model III). The fluctuations of average annual genetic effects may result from segregation of the major gene in the population.

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“…MAIJALA (1964) showed that repeatabilities of 70-80% should be obtained on the basis of 300-500 daughters. Such tests have been performed in dairy cattle in some countries with well-organized data recording, and bulls with estimated breeding values of about 20 % in twinning frequency have been found UOHANS- SON et al 1974, BAR-ANAN and BOWMAN 1974, MAIJALA and SWAJARVI 1977, SYRSTAD 1984. The daughters of such bulls should have mainly bilateral twin ovulations and a good uterine capacity and thus be adapted also for use as recipient cows in producing twins with the aid of embryo transfer technology.…”

Section: Selection For Twinning or Litter Sizementioning

confidence: 99%

Genetic control of reproduction and lactation in ruminants¹

Maijala¹

1987

J Animal Breeding Genetics

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Inheritance of multiple births in cattle

Cited by 16 publications

References 5 publications

Genetic variation in twin calving incidence in herds with a high phenotypic mean

Genetic variation in twin calving incidence in herds with a high phenotypic mean

Genetic and permanent environmental variability of twinning in Thoroughbred horses estimated via three threshold models

Genetic control of reproduction and lactation in ruminants¹

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Inheritance of multiple births in cattle

Cited by 16 publications

References 5 publications

Genetic variation in twin calving incidence in herds with a high phenotypic mean

Genetic variation in twin calving incidence in herds with a high phenotypic mean

Genetic and permanent environmental variability of twinning in Thoroughbred horses estimated via three threshold models

Genetic control of reproduction and lactation in ruminants1

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Genetic control of reproduction and lactation in ruminants¹