Comparison of ten friesian strains in poland under field conditions. I. Strain comparison for growth rate

Stolzman, M.; Jasiorowski, H.; Reklewski, Z.; Zarnecki, A.; Kalinowska, G.

doi:10.1016/0301-6226(88)90033-4

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…Genetic merits of daughters of bulls from 10 Holstein-Friesian strains were compared in Polish commercial farms. The results later reported by Stolzman et al (1988) and Zarnecki et al (1991) indicated that Holstein strains from the United States, Canada, and Israel, and the Friesian strain from New Zealand yielded more milk in Poland compared with European strains (Denmark, Netherlands, Poland, Sweden, the UK, and West Germany). Another study (Rozzi et al, 1990) on a multinational genetic evaluation (the United States, Canada, and Italy) also showed that the average genetic merit of imported sires to Canada and Italy (mainly from the United States) was higher than for domestic sires for milk and fat yield.…”

Section: Introduction and Historymentioning

confidence: 86%

Invited review: A quarter of a century—International genetic evaluation of dairy sires using MACE methodology

Nilforooshan

Jorjani

2022

Journal of Dairy Science

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For the past few decades, the international exchange of genetic materials has accelerated. This acceleration has been more substantial for dairy cattle compared with other species. The industry faced the need to put international genetic evaluation (IGE) systems in place. The Interbull Centre has been conducting IGE for various dairy cattle breeds and traits. This study reviews the past and the current status of IGE for dairy cattle, emphasizing the most prominent and wellestablished method of IGE, namely multiple acrosscountry evaluation (MACE), and the challenges that should be addressed in the future of IGE. The first IGE methods were simple conversion equations. Only a limited number of common bulls between pairs of countries were considered. These bulls were a biased sample of highly selected animals, with their daughters under preferential treatment in the importing countries. Genetic relationships among animals were not considered either. The MACE method was the first IGE method based on mixed-model theory that could handle genotype by environment interaction (G × E) between countries. The G × E between countries is handled by treating the same trait in different countries as different traits, with genetic correlations less than unity between the traits. The G × E between countries is not solely due to different genetic expressions in different environments (countries), but is also attributable to different units or ways of measuring the trait, data editing, and statistical approaches and models used in different countries. The MACE method also considers different genetic means, genetic groups for unknown parents, heterogeneous genetic and residual variances among countries, and heterogeneous residual variances (precision weights for observations) within countries. Other IGE methods that came after MACE are rooted in MACE. The genomic revolution of the industry created new needs and opportunities. However, an unwanted aspect of it was genomic preselection bias. Genomic preselection causes directional information loss from pre-culled animals (bias) in statistical models for genetic and genomic evaluations, and preselected progeny of a mating are no longer a random sample of possible progeny from that mating. National genetic evaluations without genotypes are input to MACE, and biases in national evaluations are propagated internationally through MACE. Genomic preselection for the Holstein breed is a source of concern for introducing bias to MACE, especially when genomic preselection is practiced intensively in the population. However, MACE continues to be useful for other breeds, among other species, or for non-IGE purposes. Future methods will need to make optimum use of genomic information and be free of genomic preselection bias.

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Section: Introduction and Historymentioning

confidence: 86%

Invited review: A quarter of a century—International genetic evaluation of dairy sires using MACE methodology

Nilforooshan

Jorjani

2022

Journal of Dairy Science

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“…The design of the trial and the experimental procedures were described in detail by Stolzman et al (1981Stolzman et al ( , 1988. Semen from 388 young, unproven bulls from 10 cooperating countries (Canada, Denmark, Israel, New Zealand, Poland, Sweden, The Netherlands, the United Kingdom, the US, and West Germany) was used to inseminate 33.699 Polish Black and White mature cows on 70 state dairy farms.…”

Section: Methodsmentioning

confidence: 99%

Lifetime yield and herd life for crosses of Friesian strains in Poland

Zarnecki¹,

Norman²,

Jamrozik³

1997

J. Anim. Feed Sci.

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Lifetime yield performance and herd life through nine lactations were examined for 7353 F, cows that resulted from crosses of 374 Holstein or Friesian bulls from Canada, Denmark, Israel, New Zealand, Sweden, The Netherlands, the United Kingdom, the US, and West Germany with Polish Black and White cows. Lifetime traits included number of calvings, days in milk (DIM), days of productive life (DPL), age at last calving, age at disposal, lifetime milk and fat yields, and mean milk and fat yields per DIM. Mean number of calvings was 3.8. Ranking of strains based on means and mixed model solutions demonstrated the superiority of US, Canadian, New Zealand, and Israeli strains for measures of longevity and lifetime performance. For all lifetime traits Polish, Netherlands, and Danish strains ranked lowest. Sire and error components of variance were estimated with a REML procedure. Heritabilities of lifetime milk and fat yields and measures of herd life were low (0.03 to 0.07); heritabilities for mean yield per DIM were 0.22 for milk and 0.19 for fat.

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“…The Holsteinization process of Black and White dairy cattle populations (Philipsson 2011) represents a clear example of how exchanges of genetic material can impact a cattle breed and national breeding programs worldwide. In the '70s, the results of an FAO experiment highlighted the significant superiority in milk production of North-American Holstein-Friesians sires over European ancestral Black and White dairy populations (Stolzman et al 1988;Zarnecki et al 1991). The results of this experiment led to increased trade of sires' frozen semen among countries, mainly from North America to the rest of the world.…”

Section: International Evaluations In Cattle: From Conversion Equatio...mentioning

confidence: 99%

International genetic and genomic evaluations of beef cattle

Bonifazi¹

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. International genetic and genomic evaluations of beef cattle.PhD thesis, Wageningen University, the Netherlands.In cattle, advancements in reproductive technologies such as artificial insemination allowed breeders to access the genetic material of superior bulls from foreign countries. However, animals' estimated breeding values (EBV) computed from different national evaluations are not directly comparable across countries due to differences in scales and genetic bases, trait and model definitions, and the possible presence of genotype-by-environment interactions. International evaluations account for such differences by jointly analysing all national data and modelling the same trait recorded in different countries as different correlated traits. The resulting international EBV (EBV INT ) facilitate the comparison of domestic and foreign sires and worldwide trading of their genetic material. This thesis aimed to improve and further develop methodologies for international beef cattle evaluations (Interbeef) by addressing various challenges, mainly related to: i) the estimation of across-country genetic correlations (r g ) and their impact on the EBV INT ; ii) the inclusion of national genomic information; and iii) the development of an official procedure for participating countries to integrate the distributed EBV INT back into their national evaluations. First, I showed that both large and small participating countries benefit from current Interbeef pedigree-based evaluations. Second, I showed the feasibility of estimating across-country r g using a multi-trait approach that simultaneously fits data from all countries and proposed data sub-setting strategies to improve computational time. Third, I showed that the current practice of assuming across-country direct-maternal r g to be 0 has limited impact on the EBV INT of animals of interest such as publishable sires, i.e., sires that meet Interbeef publications rules. On the other hand, assuming zero within-country direct-maternal r g impacts the EBV INT of such animals. Fourth, I developed international genomic evaluations for beef cattle using a single-step SNPBLUP approach (ssSNPBLUP). International ssSNPBLUP evaluations lead to higher accuracies compared to both current international pedigree evaluations and either national pedigree or genomic evaluations, while keeping similar or slightly reduced level and dispersion bias. Finally, I developed a generalized procedure to integrate pedigree-based or singlestep EBV INT of publishable sires into national evaluations. The procedure can be easily implemented with current software. Compared to national evaluations without integration, the integration reduces level bias, gives similar dispersion, and increases accuracies of publishable sires' EBV INT . Overall, this thesis contributes to the development of international evaluations of beef cattle.

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Comparison of ten friesian strains in poland under field conditions. I. Strain comparison for growth rate

Cited by 9 publications

References 8 publications

Invited review: A quarter of a century—International genetic evaluation of dairy sires using MACE methodology

Invited review: A quarter of a century—International genetic evaluation of dairy sires using MACE methodology

Lifetime yield and herd life for crosses of Friesian strains in Poland

International genetic and genomic evaluations of beef cattle

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