Impacto Da Idade Ao Parto No Desempenho Produtivo E Reprodutivo Em Vacas Holandesas Primíparas

Grebogi, Alceu Miguel; Ostrensky, André; Pohl, Franziska; Almeida, R; Weiss, R R; Kozicki, Luiz Ernandes; Breda, José Carlos dos Santos; Giacomeli, A M

doi:10.5380/avs.v13i1.11555

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The average calving interval was approximately 14 months (Table 2), similar to the reported by Zafar et al (2008) and Grebogi et al (2008), who found 14.3 and 13 months, respectively, in Holstein cows. According to Bahonar et al (2009) a period of 12 to 13 months, can be considered optimal for dairy cows.…”

Section: Resultssupporting

confidence: 88%

Genetic associations between reproductive and linear-type traits of Holstein cows in Brazil

et al. 2017

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-This study aimed to estimate heritability, genetic, and residual correlations between reproductive traits such as age at first calving, calving interval, dry period, and first service period and linear type traits measured in Holstein cows born between the years 1990 and 2008 in Brazil. The (co)variance components were estimated by restricted maximum likelihood, using the MTDFREML software. The heritability for reproductive traits and linear-type traits ranged from 0.02 to 0.03 and from 0.07 to 0.40, respectively. Estimates of genetic correlations between reproductive and linear-type traits ranged from -0.23 (top line) to 0.28 (angularity) to age at first calving, from -0.54 (final score) to 0.34 (foot angle) to calving interval, from -0.23 (angularity) to 0.56 (stature) to dry period, and from -0.52 (final score) to 0.36 (height udder) to first service period. Direct selection for any of the reproductive traits implies low genetic gains by virtue of their low heritabilities. Among the linear-type traits, the final score, chest width, top line, angularity, teat length, udder attachment, rear teat placement were highlighted as good auxiliary traits to improve reproductive efficiency of Holstein cows in Brazil. The simultaneous selection for reproductive and linear-type traits can lead a higher genetic progress in the reproductive traits.Key Words: age at first calving, dairy cattle, genetic parameters, reproductive efficiency Revista Brasileira de Zootecnia

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Section: Resultssupporting

confidence: 88%

Genetic associations between reproductive and linear-type traits of Holstein cows in Brazil

et al. 2017

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“…The values found for IP and PS were higher than those reported by other researchers. Grebogi et al (2008) and Almeida et al (2017) found mean values of 390 and 110, and 420 and 61 days, for IP and PS respectively. However, they were like those found by Marestone et al (2013), who reported mean values of 449 (±118.2) and 178 (±118.73) days for Holstein cows in the states of São Paulo and Paraná, respectively.…”

Section: Table 5 Effect Of the Season On The Productivity And Milk Comentioning

confidence: 94%

Productive and reproductive performance of Holstein cows in Agreste, Pernambuco, from 2007 to 2017

Abreu

Barbosa

Silva

et al. 2020

Semina: Ciênc. Agrár.

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Systematic analysis of experimental data on productive and reproductive traits of Brazilian dairy herds compared with breeders’ association records

Marcondes

2022

Anim. Prod. Sci.

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Context Dairy farming in Brazil is characterised by heterogeneity in production techniques, herds and kinds of producers; nonetheless, it has expanded in recent years. The data available in the scientific literature regarding breeds used in the system are inconsistent and may not represent the current genetic, productive and reproductive profile of Brazilian herds. Aim This study was developed to understand differences between animals used in experiments and those in breed control assessments. We aimed to evaluate data of Holstein, Gyr, Guzerat, Jersey, Sindhi, Brown Swiss, Holstein × Gyr and Holstein × Guzerat cattle on the traits 305-day milk yield, fat and protein contents, lactation length, age at first calving, and calving interval by comparing research literature and national official control records. Methods National breeders’ associations (NBAs) for each breed or cross were asked to send their official control from 2019 for comparison with 15 years of published data that we retrieved from the literature. Key results Holsteins showed the closest mean for milk yield between literature and NBA data. In Holstein × Gyr crosses, increasing the proportion of Gyr genes decreased milk yield. Jersey data showed the greatest variance between the literature and NBA. For Brown Swiss milk fat, literature values were 12.7% above NBA values. Holsteins had the longest lactation (305 days), and 5/8 Holstein × Gyr the shortest (262 days). For age at first calving, Jerseys were the youngest (26.3 months) and Guzerats the oldest (45.7 months). Jersey cows showed the shortest (best) mean calving interval (12 months), and Sindhi the longest (17 months). NBA data were not available for comparison for some traits in some breeds/crosses. Conclusions Holstein was the most productive breed. Holstein × Gyr crosses, because of adaptation and management, were able to express their productive and reproductive potentials. There was variance between literature and NBA data. Implications We expected that the literature data would somewhat represent the NBA data; however, for most traits, NBA data do not coincide (or do not exist). Literature data need to be collected to represent more closely what is happening at the field level in the national dairy industry.

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Impacto Da Idade Ao Parto No Desempenho Produtivo E Reprodutivo Em Vacas Holandesas Primíparas

Cited by 3 publications

References 3 publications

Genetic associations between reproductive and linear-type traits of Holstein cows in Brazil

Genetic associations between reproductive and linear-type traits of Holstein cows in Brazil

Productive and reproductive performance of Holstein cows in Agreste, Pernambuco, from 2007 to 2017

Systematic analysis of experimental data on productive and reproductive traits of Brazilian dairy herds compared with breeders’ association records

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