Estimation of the economic value of herd‐life length based on simulated changes in survival rate

Sasaki, Osamu; Takeda, H.; Nishiura, Akiko

doi:10.1111/asj.13158

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…When young sires were selected according to their genetic ability for DO, the estimated annual economic merit was 1,061.4 yen and 493.9 yen in Hokkaido and in the other regions, respectively. Under the same economic and genetic conditions of the present study, Sasaki, Takeda, and Nishiura (2019) reported that the estimated economic value based on selection for the genetic ability for 305-day milk yield were 1,268 yen in Hokkaido and 2,097 yen in the other regions. Furthermore, the estimated economic value based on selection for the genetic ability for herd life was 1,268 yen in Hokkaido and 2,097 yen in the other regions.…”

Section: Economic Response Of Genetic Selection By Days Opensupporting

confidence: 69%

The economic value of days open in Holstein cows in Japan based on simulated changes in conception rate

Sasaki

Takeda

Nishiura

2020

Animal Science Journal

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Increasing herd-life length and culling parity with increasing conception rate (CR) is necessary to increase lifetime profit from dairy cow production. Economic values of days open (DO) were determined by calculating changes in fertility traits, herd-life length, and milk yield when the simulated CR were changed in increments of 1% from −5% to 5% from the basal levels, which were obtained for Hokkaido and regions other than Hokkaido separately. When CR increased, number of artificial inseminations, DO, and milking length decreased. Furthermore, culling parity, and annual milk yield increased. Herd-life length increased in Hokkaido and decreased in the other regions. The economic values of CR were 1,623.8 to 946.8 yen and of DO were 857.4 to 399.0 yen. Relative economic values of milk yield to days open per genetic standard deviation were higher in the other regions than in Hokkaido where the economic effect of selection for DO was expected to be equal to selection for 305-day milk yield and herd life. If the survival rate of multipara cows in the other regions increases, then the economic value of DO would similarly increase in Hokkaido.

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Section: Economic Response Of Genetic Selection By Days Opensupporting

confidence: 69%

The economic value of days open in Holstein cows in Japan based on simulated changes in conception rate

Sasaki

Takeda

Nishiura

2020

Animal Science Journal

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“…The contribution of livestock to the country's economy is too low when compared with the population size. This might be due to weak estimation methodology or weak analysis of economic values of livestock products and poor plane of nutrition, prevalence of disease and lack of appropriate breeding strategies (Mezgebe et al, 2018;Sasaki et al, 2019). To divert this challenges; identification and phenotypic characterization of cattle genetic resources are necessary in order to develop breed improvement programs (FAO, 2007).…”

Section: Introductionmentioning

confidence: 99%

Phenotypic characterization of genetic resources of indigenous cattle in West Gondar zone of Ethiopia

Emru¹,

Abegaz²,

Getu³

et al. 2020

ojafr

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This study was conducted to identify and phenotypic characterization of the existing indigenous cattle genetic resources in the three districts of West Gondar zone of Amhara Region based on their descriptive morphological characteristics. A total of six sampling sites were purposively selected based on the distribution of unique cattle types. Key informant and focus group discussions were used to identify the new genetic resources. A total of 180 adult male and 720 female cattle were selected for 20 morphological and 9 biometrical traits. The focus group discussions revealed that, diversified indigenous cattle were found (Fellata in Quara, Rutana in Metema, Miramir in West Armachiho and Qocherie from all Districts). The overall mean linear body measurements of male cattle for horn length, body length, heart girth, canon bone length and cannon bone circumferences were 23.92 cm, 127.97 cm, 161.15cm, 20.37 cm and 19.81 respectively. Females had horn length (25.86 cm), body length (122.85 cm), pelvic width (37.47 cm) and canon bone length (19.26 cm), canon bone circumferences (18.36 cm) and mouth circumferences (36 cm). In a discriminate analysis, all sampled populations were classified with the overall hit rates of 75% for males and 60% for females. The shortest and longest mehalanobis distances were between Abrajira with Dubaba (0.762) and Gendawuha Birshign with Mirt Gelegu (37.88) for male and Gendawuha Birshign with Dubaba (0.358) and Gendawuha Birshign with Mirt Gelegu (29.37) for females, respectively. In stepwise discriminate analysis the top traits which were highly discriminated male cattle populations were cannon bone length, horn length and cannon bone circumferences. This was similar in females except the replacement of cannon bone circumferences with mouth circumferences. Three clusters were formed (Fellata from Mirt Gelegu in cluster one and Qocherie from Gendawuha Birshign, Dubaba and Abrajira in cluster two and Rutta from Lominat Forgena and Miramir from Gilal Wuha in cluster three. Three indigenous cattle types were identified with their phenotypic features and further molecular characterization should be done to confirm their genetic distinctiveness.

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“…The conception rate after AI critically influences dairy profitability because an increase in conception rate leads to an increase in the annual income per cow (González-Recio et al, 2004;Sasaki et al, 2019). Because the energy requirement for milk production in dairy cows dramatically changes before and after the first calving, the feeding system and reproduction management must also be appropriately changed during this transition to achieve income maximization (Ettema et al, 2017;Bittante et al, 2020;Reese et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Environmental factors affecting the conception rates of nulliparous and primiparous dairy cattle

Ukita

Yamazaki

Yamaguchi

et al. 2022

Journal of Dairy Science

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Dairy cattle must allocate energy to milk production and reproduction. Therefore, understanding the environmental factors that affect conception rates in nulliparous and primiparous cows is helpful in appropriate feeding management strategies before and after calving. Accordingly, the aim of this study was to investigate the influence of environmental factors before and after the first calving on the conception rate, representing the starting point of milk production. The records of the first artificial insemination (AI) from Holstein nulliparous cows (n = 533,672) and primiparous cows (n = 516,710) in Hokkaido, Japan, were analyzed using separate multivariable logistic regression models. The mean conception rates for nulliparous and primiparous cows from 2012 to 2018 were 55.2 and 39.2%, respectively. In both nulliparous and primiparous cows, the conception rate of crossbreeding using Japanese Black (JB) semen was significantly higher than that for purebred Holstein breeding. The conception rate using sexed semen decreased in the warmer months only in nulliparous cows. Moreover, we grouped primiparous cows according to milk yield during peak lactation (PY; < 25,(25)(26)(27)(28)(29)(30)(30)(31)(32)(33)(34)(35) ≥35 kg) and the interval from calving to first insemination (CFI; < 60, 60-79, 80-99, ≥100 d), and evaluated their combined effect on the conception rate. Both PY and CFI strongly affected the conception rate in primiparous cows, which decreased with an increase in PY, even for the group with CFI ≥100 d; however, the conception rate increased for a CFI ≥60 d regardless of PY. Taken together, this study demonstrates the long-term effect of PY and an independent effect of CFI on the conception rate of cows. These results provide guidance for management to execute appropriate AI implementation strategies before and after lactation.

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Estimation of the economic value of herd‐life length based on simulated changes in survival rate

Cited by 7 publications

References 14 publications

The economic value of days open in Holstein cows in Japan based on simulated changes in conception rate

The economic value of days open in Holstein cows in Japan based on simulated changes in conception rate

Phenotypic characterization of genetic resources of indigenous cattle in West Gondar zone of Ethiopia

Environmental factors affecting the conception rates of nulliparous and primiparous dairy cattle

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