Estrutura populacional da raça Girolando

Canaza-Cayo, Ali William; Lopes, Paulo Sávio; Silva, Marcos Vinícius Gualberto Barbosa da; Cobuci, Jaime Araújo; Torres, Robledo de Almeida; Martins, Marta Fonseca; Arbex, Wagner

doi:10.1590/0103-8478cr20131307

Cited by 22 publications

(12 citation statements)

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“…The proportion of identical genes by descent carried by the offspring is characterized by F, which in turn confirms the pedigree integrity (Canaza-Cayo et al, 2014). In the present study, the distribution of animals per year and inbreeding levels (Table 2) indicates that the Holstein cattle population in southern Brazil is controlled by the mating process; therefore, the population exhibits relatively low levels of inbreeding.…”

Section: Discussionsupporting

confidence: 82%

Population structure and inbreeding of Holstein cattle in southern Brazil

Sieklicki

Mulim

Pinto

et al. 2020

Revista Brasileira De Zootecnia

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Breeding and genetics Full-length research article Population structure and inbreeding of Holstein cattle in southern Brazil ABSTRACT-The present investigation aimed to evaluate the population structure and inbreeding of Holstein herds in southern Brazil. To carry out the analysis, the Associação Paranaense de Criadores de Bovinos da Raça Holandesa (APCBRH) in Brazil provided the data, which consisted of a pedigree file of 206,796 animals born between 1970 and 2014. Results regarding the following parameters were determined: pedigree integrity, effective number of founders, effective number of ancestors, generation interval, inbreeding coefficient, realized effective population size, and average relatedness coefficient. POPREP and ENDOG v.4.5 software packages were employed to estimate these parameters. Based on the data set, the mean generation interval was found to be 6.3 years, and the average inbreeding coefficient, related to inbred animals, was 4.99%. Furthermore, the realized effective population size varied throughout the time period, ranging from 22 to 114, whereas the rate of inbreeding in this same period showed a decreasing trend towards the later years in the period until 2014. Upon evaluation, average relatedness coefficient was estimated to be 0.71%. Moreover, the effective number of founders and ancestors were estimated as 418 and 400 animals, respectively. According to the level of inbreeding observed, it could be noticed that genetic diversity remains elevated, which will be important to the genetic progress in the Holstein breeding program in Southern Brazil.

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Section: Discussionsupporting

confidence: 82%

Population structure and inbreeding of Holstein cattle in southern Brazil

Sieklicki

Mulim

Pinto

et al. 2020

Revista Brasileira De Zootecnia

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“…Strategies for crossbreeding Bos taurus taurus with Bos taurus indicus are important in Brazil to achieve the balance between yield and adaptability of animals to adverse conditions in the country (Santos et al 2013) and explore the benefits of heterosis and complementarity originated from the crossbreeding between different breeds (Canaza-Cayo et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Estimates of genetic and crossbreeding parameters for 305-day milk yield of Girolando cows

Daltro

Silva²,

Gama

et al. 2019

Italian Journal of Animal Science

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The objective of this work was to evaluate the effects of breed and heterosis on the estimates of genetic parameters of 305-day milk yield (305MY), by fitting milk yield data to the Wood, Mixed Log, Morgan, and Wilmink non-linear models. A total of 258,891 test-day milk yield records of 37,965 Holstein (H), Gyr (G), and Girolando (1/2 H, 1/4 H, 3/4 H, 3/8 H, 5/8 H and 7/8 H genetic groups) cows from 1840 herds were collected in the state of Minas Gerais, Brazil, in the period of 1998 to 2014. The pedigree file included 36,640 animals, 3677 bulls and 24,472 cows. The genetic parameters were obtained by one-character analysis using the AIREMLF90 software. The heritability estimates of 305MY, and of 305MY fitted to the different nonlinear models ranged from 0.14 to 0.20. Most genetic groups had heterosis effect, with the greatest effects for 305MY on 1/2 H (1/2 Holstein Â 1/2 Gyr) cows, presenting a milk yield of 1112.73 kg higher than the average of their parents. The results indicate that most genetic groups of Girolando present heterosis effect for 305MY estimated through nonlinear models, and the possibility of obtaining moderate genetic gains when these animals are subjected to selection procedures. HIGHLIGHTS The use Girolando cows in production systems in Brazil has shown positive results of production. This greater productive efficiency may be because of heterosis on the production and adaptation of these animals. The effect of breed and heterosis can be included in traditional models for the improvement of selection.

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“…It was estimated that about 80% of the milk produced in Brazil comes from cows that have Holstein and Gyr genes in their genetic composition (Silva et al 2015). The crossbreeding between those two breeds (Holstein and Gyr) has been an important tool in order to increase milk yield and reproductive efficiency and improve the adaptation of animals in the tropical conditions, which uses the benefits from the heterosis expression and complementarity between breeds (Canaza-Cayo et al 2014;Prata et al 2015). Such benefits have contributed to the beginning of Girolando cattle formation in 1940 (Silva et al 2015).…”

Section: Introductionmentioning

confidence: 99%