Genetic Evaluation of Fertility Traits of Dairy Cattle Using a Multiple-Trait Animal Model

Liu, Z.; Jaitner, J.; Reinhardt, F; Pasman, E; Rensing, S; Reents, R.

doi:10.3168/jds.2008-1029

Cited by 82 publications

(102 citation statements)

References 8 publications

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“…Weigel and Rekaya, 2000;Ranberg et al, 2003). Genetic correlations among various fertility traits generally agreed with previous findings (Kadarmideen et al, 2003;Liu et al, 2008). Consistent with our results, Kadarmideen et al (2003) reported genetic correlations among fertility traits were generally high.…”

Section: Genetic and Phenotypic Correlationssupporting

confidence: 92%

Genetic relationship between milk urea nitrogen and reproductive performance in Holstein dairy cows

Hossein-Zadeh

Ardalan

2011

Animal

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The objective of this study was to describe the genetic and phenotypic relationship between milk urea nitrogen (MUN) and reproductive traits in Iranian Holstein dairy cows. Test-day MUN data obtained from 57 301 dairy cows on 20 large dairy herds in Iran between January 2005 and June 2009. Genetic parameters for MUN and reproductive traits were estimated with a five-trait model using ASREML program. Random regression test-day models were used to estimate heritabilities separately for MUN from first, second and third lactations. Regression curves were modeled using Legendre polynomials of order 3. Herd-year-season along with age at calving was included as fixed effects in all models for reproductive traits. Heritabilities for MUN and reproductive traits were estimated separately for first lactation, second lactation and third lactation. The estimated heritabilities for MUN varied from 0.18 to 0.22. The heritability estimate was low for reproductive traits, which ranged from 0.02 to 0.06 for different traits and across parities. Except for days open, phenotypic and genetic correlations of MUN with reproductive performance traits were close to zero. Genetic correlations between MUN and days open were 0.23, 0.35 and 0.45 in first, second and third lactation, respectively. However, the phenotypic correlation between MUN at different parities was moderate (0.28 to 0.35), but the genetic correlation between MUN at different parities was high and ranged from 0.84 to 0.97. This study shows a limited application of MUN for use in selection programs to improve reproductive performance.

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Section: Genetic and Phenotypic Correlationssupporting

confidence: 92%

Genetic relationship between milk urea nitrogen and reproductive performance in Holstein dairy cows

Hossein-Zadeh

Ardalan

2011

Animal

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“…Jamrozik et al (2005), Tsuruta et al (2009) and Bastin et al (2010) estimated that the heritabilities of NR to 56 days at first lactation in Canadian Holstein cows were 0.020 and 0.026, respectively. Liu et al (2008) also reported that the heritabilities of NR to 56 days, as estimated from 25.5 million insemination records, were 0.012 for heifers and 0.015 for dairy cows in Germany, Austria and Luxembourg. Our heritability estimates for CR were in the range of those recently reported for CR or NR for dairy cows.…”

Section: Discussionmentioning

confidence: 98%

“…Many indicators of female fertility are used, including days open (DO), calving interval (CI), days from calving to first service (DFS), non-return rate (NR) and CR at first service (Liu et al, 2008). Interval traits (DO, CI and DFS) are used only for cows, because those traits are estimated by using information associated with calving.…”

Section: Introductionmentioning

confidence: 99%

Relationships between conception rate in Holstein heifers and cows and milk yield at various stages of lactation

Hagiya

Terawaki

Yamazaki

et al. 2013

Animal

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We investigated the relationships between conception rates (CRs) at first service in Japanese Holstein heifers (i.e. animals that had not yet had their first calf) and cows and their test-day (TD) milk yields. Data included records of artificial insemination (AI) for heifers and cows that had calved for the first time between 2000 and 2008 and their TD milk yields at 6 through 305 days in milk (DIM) from first through third lactations. CR was defined as a binary trait for which first AI was a failure or success. A threshold-linear animal model was applied to estimate genetic correlations between CRs of heifers or cows and TD milk yield at various lactation stages. Two-trait genetic analyses were performed for every combination of CR and TD milk yield by using the Bayesian method with Gibbs sampling. The posterior means of the heritabilities of CR were 0.031 for heifers, 0.034 for first-lactation cows and 0.028 for second-lactation cows. Heritabilities for TD milk yield increased from 0.324 to 0.433 with increasing DIM but decreased slightly after 210 DIM during first lactation. These heritabilities from the second and third lactations were higher during late stages of lactation than during early stages. Posterior means of the genetic correlations between heifer CR and all TD yields were positive (range, 0.082 to 0.287), but those between CR of cows and milk yields during first or second lactation were negative (range, 20.121 to 20.250). Therefore, during every stage of lactation, selection in the direction of increasing milk yield may reduce CR in cows. The genetic relationships between CR and lactation curve shape were quite weak, because the genetic correlations between CR and TD milk yield were constant during the lactation period.

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“…For these reasons, the selection programs are often confronted with the challenge of maintaining satisfactory reproductive performances and high levels of milk production (Weigel and Rekaya, 2000). Therefore, it is necessary to include fertility traits in the selection programs in order to improve fertility or minimize the deterioration of these traits (Liu et al, 2008;Ghiasi et al, 2011). Heritability estimates of reproductive performance were low and ranged from zero to 0.1 (Muir et al, 2004;Sewalem et al, 2010;Ghiasi et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters of reproductive traits in Tunisian Holsteins

et al. 2016

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Abstract. Multi-trait Bayesian procedure was used to estimate genetic parameters for reproductive traits in Tunisian Holstein cows. A total of 31 348 lactations of the calving years 2005 to 2012 were analyzed. Fertility traits were the calving interval (CI), days open (DO), days to first insemination (DFI), days from first insemination to conception (FIC), and number of inseminations per conception (NI). Posterior means of heritabilities of CI, DO, DFI, FIC, and NI were 0.047, 0.03, 0.025, 0.024, and 0.069, respectively. Posterior means of repeatabilities of the same respective traits were 0.106, 0.094, 0.051, 0.036, and 0.17. Genetic correlations among female fertility traits were also computed. Calving interval and DO had the highest genetic correlation estimate (0.85) because they have overlapping genetic meanings. The lowest genetic correlation estimate ( − 0.25) was found between DFI and NI. Genetic parameter estimates are low and are even lower than those reported in most literature, implying that more focus should be put upon improving the management of reproduction in dairy cattle herds in Tunisia.

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Genetic Evaluation of Fertility Traits of Dairy Cattle Using a Multiple-Trait Animal Model

Cited by 82 publications

References 8 publications

Genetic relationship between milk urea nitrogen and reproductive performance in Holstein dairy cows

Genetic relationship between milk urea nitrogen and reproductive performance in Holstein dairy cows

Relationships between conception rate in Holstein heifers and cows and milk yield at various stages of lactation

Genetic parameters of reproductive traits in Tunisian Holsteins

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