Genetic parameters for dystocia, milk yield and age at first calving in Brazilian Holstein cows

Stefani, Gabriela; Aquaroli, Daniele Brandão; Júnior, João Batista Gonçalves Costa; Júnior, Mário Luiz Santana; Tonhati, Humberto; Sesana, R. C.; Faro, Lenira El

doi:10.1080/09712119.2020.1856115

Cited by 8 publications

(8 citation statements)

References 26 publications

(42 reference statements)

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“…The obtained estimates of heritability coefficients are close to those obtained by other researchers, in particular, Stefani et al (2021), although the heritability of milk yield at 305 days of lactation in this controlled study was higher (0.33 vs. 0.15). The use of a mixed linear threshold model allowed for a higher heritability coefficient for calving difficulty (0.1787) than when using linear models (Tomka, 2018;Silvestre et al, 2019), which allowed increasing the reliability of estimates of the breeding value of breeding bulls based on this feature.…”

Section: Table 5 Estimates Of the Breeding Value Of Breeding Bulls By...supporting

confidence: 89%

Assessment of the genetic parameters and breeding value of bulls-producers of the Ukrainian black speckled milky breed by the main characteristics

Ruban¹,

Danshyn²

2022

Animal Science and Food Technology

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Evaluation and selection of breeding bulls based on economically important characteristics is the main tool in modern systems of genetic improvement of dairy cattle. The purpose of the study was to analyse the influence of environmental and genetic factors on the traits of milk productivity, reproduction, productive longevity, and the difficulty of calving, to assess the genetic parameters and breeding value of breeding bulls based on these traits. The research material was data on the indicators of productivity, reproduction, and productive longevity of cows of the Ukrainian black speckled milky breed of the agricultural cooperative “Vostok” of the Kharkiv region. A multidimensional linear-threshold model was used to calculate genetic parameters (heritability coefficients and genetic correlations) and breeding values of breeding bulls. A probable phenotypic negative association was identified between calving difficulty and milk yield for 305 days (r= -0.2244±0.0266, P>0.999); an increase in calving difficulty by 1 point leads to a decrease in milk yield for 305 days of lactation by 1281.0 kg. Calculated estimates of genetic correlation indicate the presence of a fairly high relationship between milk yield for 305 days of lactation and the service period (over +0.5), a negative relationship between the service period and productive longevity (about -0.37), and a positive relationship between the service period and calving difficulty (about +0.26). This data indicates the presence of genetic antagonism between milk productivity and the level of reproduction of dairy cows, the negative impact of the extended service period on the length of stay of cows in the dairy herd, and the impact of calving difficulty on the deterioration of cow fertility. Estimates of the breeding value of breeding bulls by milk yield, service period, productive longevity, and calving difficulty were calculated. The results obtained indicate the expediency of including traits of reproduction, productive longevity, and difficulty of calving cows in the breeding index, which is used to evaluate and select bulls-producers of the Ukrainian black speckled milky breed

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Section: Table 5 Estimates Of the Breeding Value Of Breeding Bulls By...supporting

confidence: 89%

Assessment of the genetic parameters and breeding value of bulls-producers of the Ukrainian black speckled milky breed by the main characteristics

Ruban¹,

Danshyn²

2022

Animal Science and Food Technology

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“…To the best of our knowledge, no other studies on other Zebu cattle breeds have reported genetic correlations between AFC and MY305. Genetic selection involving milk yield and AFC should be performed with caution to avoid an increasing risk of dystocia in younger cows, mainly those with high genetic advantage for milk yield [22]. The genetic correlations among AFC and milk components were low (-0.31 to -0.27) but favorable, suggesting that the selection process for AFC would result in a milk yield with higher 305-day cumulative solid content or vice versa.…”

Section: A C C E P T E D a R T I C L Ementioning

confidence: 99%

Genetic study of quantitative traits supports the use of Guzerá as dual-purpose cattle

Carrara

Peixoto²,

Veroneze

et al. 2022

Anim Biosci

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Objective:The aim of this study was to estimate genetic parameters for 305-day cumulative milk yield and components, growth, and reproductive traits in Guzerá cattle. Methods:The evaluated traits were 305-day first-lactation cumulative yields (kg) of milk (MY305), fat (FY305), protein (PY305), lactose (LY305), and total solids (SY305); age at first calving (AFC) in days; adjusted scrotal perimeter (cm) at the ages of 365 (SP365) and 450 (SP450) days; and adjusted body weight (kg) at the ages of 210 (W210), 365 (W365) and 450 (W450) days. The (co)variance components were estimated using the restricted maximum likelihood method for single-trait, bi-trait and tri-trait analyses. Contemporary groups and additive genetic effects were included in the general mixed model. Maternal genetic and permanent environmental effects were also included for W210. Results:The direct heritability estimates ranged from 0.16 (W210) to 0.32 (MY305).The maternal heritability estimate for W210 was 0.03. Genetic correlation estimates among milk production traits and growth traits ranged from 0.92 to 0.99 and from 0.92 to 0.99, respectively. For milk production and growth traits, the genetic correlations ranged from 0.33 to 0.56. The genetic correlations among AFC and all other traits were negative (-0.43 to -0.27). Scrotal perimeter traits and body weights showed genetic correlations ranging from 0.41 to 0.46, and scrotal perimeter and milk production traits showed genetic correlations ranging from 0.11 to 0.30. The phenotypic correlations were similar in direction (same sign) and lower than the corresponding genetic correlations. A c c e p t e d A r t i c l e 4 Conclusion: These results suggest the viability and potential of joint selection for dairy and beef traits in Guzerá cattle, taking into account reproductive traits.

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“…This latter result could be produced by the fact that some herds implemented a delay in the first mating to reduce the calving problems on heifers when they are used in crossbreeding. Interestingly, both parameters (Re and AFC) showed a reduced variation coefficient (C.V.) (Abanikannda & Olutogun, 2019; Bresolin et al., 2015; Mwatawala & Kifaro, 2009; Stefani et al., 2021), suggesting a high degree of homogeneity and reliability in Re and (indirectly) the existence of homogeneous reproductive management among Retinta farms as well as a high adaptation of the cows to the environmental conditions where they are bred. On the contrary, inbreeding values showed a large variability among individuals (ranging from 0% to 46.5%); nevertheless in general, they were moderate to high, with an average near to 6%.…”

Section: Resultsmentioning

confidence: 99%

Effect of the rob(1;29) translocation on the fertility of beef cattle reared under extensive conditions: A 30‐year retrospective study

Jiménez¹,

Morales

Molina

et al. 2022

Reprod Domestic Animals

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The Robertsonian translocation 1/29 (rob(1;29)) is the most worldwide widespread chromosomal abnormality in domestic animals. Previous studies have demonstrated its negative effect on fertility in dairy herds, but not in beef cattle extensively bred. In this study, we analysed the effect of rob(1;29) in a Retinta cattle breed data set gathered during the last 30 years. The data presented herein include rob(1;29) analysis of 11,505 cows from 251 herds, pedigree information of 24,790 animals and 67,457 calving records. Fertility was evaluated using estimated breeding values for the reproductive efficiency (Re), calculated as the percentage ratio between the number of calvings of an individual and the number expected in an optimal situation. Our results showed that cows carrying the heterozygote genotype showed a significant decrease in their Re (−5.10%, p < .001). No decrease was detected in free rob(1;29) animals and homozygous carriers. In addition, the incidence of rob(1;29) in the breed fertility was decreased to very low values after 30 years of avoiding selection of bulls' carrier as stallions. The effect of rob(1;29) on cattle fertility is only significant when the prevalence of carrier individuals is high. Selecting against the disease only by the paternal side reduced the incidence to negligible values.

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Genetic parameters for dystocia, milk yield and age at first calving in Brazilian Holstein cows

Cited by 8 publications

References 26 publications

Assessment of the genetic parameters and breeding value of bulls-producers of the Ukrainian black speckled milky breed by the main characteristics

Assessment of the genetic parameters and breeding value of bulls-producers of the Ukrainian black speckled milky breed by the main characteristics

Genetic study of quantitative traits supports the use of Guzerá as dual-purpose cattle

Effect of the rob(1;29) translocation on the fertility of beef cattle reared under extensive conditions: A 30‐year retrospective study

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