Impacts of Dam Age on Lifetime Productivity of Angus Replacement Beef Females

Wellnitz, Krista R.; Parsons, Cory T; Dafoe, Julia M; Boss, Darrin L; Wyffels, Samuel A; DelCurto, Timothy; Emon, Megan L Van

doi:10.3390/ani12202768

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…Upon analyzing the data presented in Table 5 , it is noteworthy that the studied groups of cows with different genotypes exhibited the distribution of the relationships “live weight × measurements” and “live weight × score for the overall assessment of the exterior”, based on the characteristics of the degrees of the heritability coefficient for the studied productive traits [ 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Aberdeen Angus Breeding Bulls in the Northern Region of the Republic of Kazakhstan

Shevchenko,

Miciński,

Brel-Kisseleva

2024

Animals

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In this study, we evaluated the progeny quality of proven bulls of the Aberdeen Angus breed in different selections. Reliable information about the productive qualities of the daughters and cows of proven bulls is limited in Kazakhstan’s scientific literature. We aimed to identify bull-improvers by comparatively evaluating cows of different genotypes in terms of productive qualities. The study was conducted in the period of 2021–2023, during which four groups of cows were formed based on origin. In conclusion, the high influence of inheritance of breeding features from bull-improvers should be highlighted: 78.6% to the daughters of cows of group I (Estonian selection from Kolos-firma LLP: EE 14465116 ABAJA PORTOS 95283, DK 1989501341 FREDERIK 95220, and EE 16966079 ABAJA PATRICK 95305) and 74.5% to the daughters of cows of group III (Canadian selection from Vishnevskoe LLP: BH BRUIN 54X 1644270 and JL DISTRICT 0311 1594050). There was less influence from proven bulls of deteriorators of the Kazakh selection: 21.4% to the daughters of cows of group II from Kolos-firma LLP (KZP156547191) and 25.5% to the daughters of cows of group IV from Vishnevskoe LLP (Henri KZT157789649 and Argus KZT155778964). Therefore, it is recommended that valuable genotypes of imported selection are used in breeding work in the Kostanay and North Kazakhstan regions for the improvement of Aberdeen Angus cattle.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Aberdeen Angus Breeding Bulls in the Northern Region of the Republic of Kazakhstan

Shevchenko,

Miciński,

Brel-Kisseleva

2024

Animals

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“…Concerning the impact of cow age on lifetime productivity of female offspring it has been found that calves born to five-year-old (or older) Angus cows had increased productivity compared to those born to four-year-old (or younger) dams [ 44 ]. When investigating the effect of calving period on the lifetime reproductive performance and productivity of Angus cows in Canada it has been concluded that heifers calving early vs calving later in their first calving season had increased pregnancy rates and weaned more calves [ 45 ].…”

Section: Resultsmentioning

confidence: 99%

Genetic diversity and phylogenetic relationship of Angus herds in Hungary and analyses of their production traits

Márton,

Szabó,

Zsolnai

et al. 2024

Anim Biosci

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Objective: This study aims to investigate the genetic structure and characteristics of the Angus cattle population in Hungary. The survey was performed with the assistance of the Hungarian Hereford, Angus, Galloway Association (HHAGA).Methods: Genetic parameters of 1,369 animals from 16 Angus herds were analyzed using the genotyping results of 12 microsatellite markers with the aid of PowerMarker, Genalex, GDA-NT2021, and STRUCTURE software. Genotyping of DNA was performed using an automated genetic analyzer. Based on pairwise identity by state values of animals, the Python networkx 2.3 library was used for network analysis of the breed and to identify the central animals.Results: The observed numbers of alleles on the 12 loci under investigation ranged from 11 to 18. The average effective number of alleles was 3.201. The overall expected heterozygosity was 0.659 and the observed heterozygosity was 0.710. Four groups were detected among the 16 Angus herds. The breeders’ information validated the grouping results and facilitated the comparison of birth weight, age at first calving, number of calves born and productive lifespan data between the four groups, revealing significant differences. We identified the central animals/herd of the Angus population in Hungary. The match of our group descriptions with the phenotypic data provided by the breeders further underscores the value of cooperation between breeders and researchers.Conclusion: The observation that significant differences in the measured traits occurred among the identified groups paves the way to further enhancement of breeding efficiency. Our findings have the potential to aid the development of new breeding strategies and help breeders keep the Angus populations in Hungary under genetic supervision. Based on our results the efficient use of an upcoming genomic selection can, in some cases, significantly improve birth weight, age at first calving, number of calves born and the productive lifespan of animals.

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“…These outcomes were strongly affected by the number of times a cow failed to wean a calf and suggested breed affects cow longevity. Culling for failure to maintain an annual calving interval can markedly reduce observed longevity but confounds reproductive success with true longevity (MacNeil & Vukasinovic, 2011; Wellnitz et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

Longevity in South African Afrikaner cows as assessed through survival analysis

Bot Steffl,

MacNeil,

Scholtz

et al. 2024

J Animal Breeding Genetics

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The Afrikaner breed of cattle is indigenous to South Africa and, due to their hardiness, was once the most popular breed amongst South African farmers, although in recent years their numbers have decreased. The goal of this study was to assess factors affecting length of productive life, defined as the interval between production of the first and last calf, in Afrikaner cattle using survival analysis. The data spanned 40 years with an observed measure of length of life for 29,379 cows from 374 herds. Relative to similar analyses, few (n = 2964; 8.4%) cows had records that were right censored. The median length of productive life of an Afrikaner cow was just less than 6 years. Cows that were younger at their first parturition had longer productive lives than those that were older at their first calving. Cows that were born in the period from December to February had shorter productive lives than those born between March and November. The estimated animal genetic variance of 0.266 resulted in a heritability estimate for length of productive life in Afrikaner cattle of 0.225. Thus, there appeared to be sufficient additive genetic variance in Afrikaner cattle to enable genetic improvement in their length of productive life.

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Impacts of Dam Age on Lifetime Productivity of Angus Replacement Beef Females

Cited by 3 publications

References 20 publications

Evaluation of Aberdeen Angus Breeding Bulls in the Northern Region of the Republic of Kazakhstan

Evaluation of Aberdeen Angus Breeding Bulls in the Northern Region of the Republic of Kazakhstan

Genetic diversity and phylogenetic relationship of Angus herds in Hungary and analyses of their production traits

Longevity in South African Afrikaner cows as assessed through survival analysis

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