The relationship between fertility and intermediate optimum type traits in Polish Holstein-Friesian cows

Jagusiak, W.; Ptak, E.; Zarnecki, A.; Satoła, Alicja

doi:10.22358/jafs/65712/2014

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Zink et al (2014) showed that deeper animals tend to perform poorly for fertility traits, with unfavorable genetic correlations increasing from first to second lactation for days open (0.14 to 0.37) and first service to conception (0.23 to 0.43), suggesting that a deeper animal would stay open for more days and would take longer to conceive. Jagusiak et al (2014) reported corroborating results, finding that daughters of bulls with a higher breeding value for BD had worse nonreturn rates in primiparous cows, with an unfavorable genetic correlation of -0.41, implying that deeper daughters would need to be re-bred more times than shallower daughters. While conception is delayed and calving interval lengthens due to unsuccessful inseminations, Can.…”

Section: Multiple Polynomial Regression Analysissupporting

confidence: 60%

“…Body depth appeared to contribute the most to lowering Pro$ index value, decreasing Pro$ by −$61.95 for every increase in one unit of RBV for BD, meaning that deeper animals are associated with a lower Pro$ index value. The contribution that BD has on other traits such as feed effciency (Manafiazar et al 2016), longevity (Zavadilová and Stipkova 2012), and fertility (Jagusiak et al 2014) in dairy cows could be a possible explanation to this effect. A recent study on the feed efficiency of dairy cows (Manafiazar et al 2016) showed that inefficient animals with high residual feed intake and high dry matter intake (DMI) tend to have greater body size, including a deeper body.…”

Section: Multiple Polynomial Regression Analysismentioning

confidence: 99%

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Conformation traits of Holstein cows and their association with a Canadian economic selection index

et al. 2022

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Pro$ is a Canadian economic selection index aimed to maximize profit by increasing production yields, while maintaining conformation and functional traits. Currently, there is an interest in understanding the individual contributions of conformation traits recorded in Canada to the overall economic value of a cow and whether they are equally important. We used multiple polynomial regression and principal component analysis to assess the association of 26 conformation traits with Pro$ using Relative Breeding Values (RBV) from 9,351 proven bulls. The best reduced regression model explained 72.5% of the Pro$ variance, with heel depth and body depth having the highest and lowest effect on Pro$ values, respectively. Four traits classified as intermediate optimum traits, e.g., teat length, showed significant linear association with Pro$ instead of quadratic, whereas bone quality was not significantly associated with the index. Principal component analysis indicated that highly profitable bulls share similar RBV, with a sub-clustering of bulls of daughters with better mammary system versus better dairy strength and feet and legs. These results provide understanding of the individual contributions of conformation traits to Pro$ and give information to guide the Canadian dairy industry on how to best consider these traits in recording and genetic evaluation programs.

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Section: Multiple Polynomial Regression Analysissupporting

confidence: 60%

Section: Multiple Polynomial Regression Analysismentioning

confidence: 99%

Conformation traits of Holstein cows and their association with a Canadian economic selection index

et al. 2022

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Genome-wide association and functional genomic analyses for body conformation traits in North American Holstein cattle

Sousa Junior,

Pinto,

Cruz

et al. 2024

Front. Genet.

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Body conformation traits are directly associated with longevity, fertility, health, and workability in dairy cows and have been under direct genetic selection for many decades in various countries worldwide. The main objectives of this study were to perform genome-wide association studies and functional enrichment analyses for fourteen body conformation traits using imputed high-density single nucleotide polymorphism (SNP) genotypes. The traits analyzed include body condition score (BCS), body depth (BD), bone quality (BQ), chest width (CW), dairy capacity (DC), foot angle (FAN), front legs view (FLV), heel depth (HDe), height at front end (HFE), locomotion (LOC), rear legs rear view (RLRV), rear legs side view (RLSV), stature (ST), and a composite feet and legs score index (FL) of Holstein cows scored in Canada. De-regressed estimated breeding values from a dataset of 39,135 North American Holstein animals were used as pseudo-phenotypes in the genome-wide association analyses. A mixed linear model was used to estimate the SNP effects, which ranged from 239,533 to 242,747 markers depending on the trait analyzed. Genes and quantitative trait loci (QTL) located up to 100 Kb upstream or downstream of the significant SNPs previously cited in the Animal QTLdb were detected, and functional enrichment analyses were performed for the candidate genes identified for each trait. A total of 20, 60, 13, 17, 27, 8, 7, 19, 4, 10, 13, 15, 7, and 13 genome-wide statistically significant SNPs for Bonferroni correction based on independent chromosomal segments were identified for BCS, BD, BQ, CW, DC, FAN, FLV, HDe, HFE, LOC, RLRV, RLSV, ST, and FL, respectively. The significant SNPs were located across the whole genome, except on chromosomes BTA24, BTA27, and BTA29. Four markers (for BCS, BD, HDe, and RLRV) were statistically significant when considering a much stricter threshold for the Bonferroni correction for multiple tests. Moreover, the genomic regions identified overlap with various QTL previously reported for the trait groups of exterior, health, meat and carcass, milk, production, and reproduction. The functional enrichment analyses revealed 27 significant gene ontology terms. These enriched genomic regions harbor various candidate genes previously reported as linked to bone development, metabolism, as well as infectious and immunological diseases.

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The relationship between fertility and intermediate optimum type traits in Polish Holstein-Friesian cows

Cited by 2 publications

References 13 publications

Conformation traits of Holstein cows and their association with a Canadian economic selection index

Conformation traits of Holstein cows and their association with a Canadian economic selection index

Genome-wide association and functional genomic analyses for body conformation traits in North American Holstein cattle

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