Reproductive performance of Japanese Black cattle: Association with herd size, season, and parity in commercial cow-calf operations

Sasaki, Yosuke; Uematsu, Mizuho; Kitahara, Go; Osawa, Takeshi

doi:10.1016/j.theriogenology.2016.07.007

Cited by 31 publications

(28 citation statements)

References 20 publications

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“…This pattern contrasts with that of Holstein dairy cattle, where reproductive performance markedly decreases during the hot season, but is consistent with the previous observations by Sasaki et al. (), who also reported reduced conception rates during winter and spring compared with summer and fall in Japanese Black cattle. Reduced conception rates have also been reported in Holstein dairy cattle when the maximum temperature on the day of AI exceeds the optimum temperature range of 10–23°C (Gwazdauskas, Lineweaver, & Vinson, ), with dramatic declines being observed during both the hot and cold seasons (Stevenson, Schmidt, & Call, ).…”

Section: Discussionsupporting

confidence: 90%

“…Reduced conception rates have also been reported in Holstein dairy cattle when the maximum temperature on the day of AI exceeds the optimum temperature range of 10–23°C (Gwazdauskas, Lineweaver, & Vinson, ), with dramatic declines being observed during both the hot and cold seasons (Stevenson, Schmidt, & Call, ). It has previously been suggested that during the cold season, sperm experience cold shock following the thawing of frozen semen for AI (Gwazdauskas et al., ; Sasaki et al., ; Stevenson et al., ). However, although CRFA showed a cyclical change in the present study and was positively correlated with THI, there was only a weak correlation between CRFA and THI on the day of AI, suggesting that this has a limited impact on the conception rate.…”

Section: Discussionmentioning

confidence: 99%

“…Reduced oestrous behaviour and extended oestrous cycles during the hot season have also been reported in Japanese Black cattle (Sakatani, Balboula, Yamanaka, & Takahashi, ). However, a recent study has shown that reduced reproductive performance is, in fact, more likely to occur during the cold season rather than the hot season (Sasaki, Uematsu, Kitahara, & Osawa, ), making the effect of environmental factors on the reproductive performance of Japanese Black cattle unclear. Therefore, in this study, we conducted an extensive field study to investigate whether there was any correlation between THI and the reproductive performance of Japanese Black cattle.…”

Section: Introductionmentioning

confidence: 99%

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Impaired reproduction in Japanese Black cattle under cold environmental conditions

Nabenishi

Yamazaki

2017

Reprod Domestic Animals

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Environmental factors such as the temperature-humidity index (THI) are known to affect reproductive parameters in cattle. Therefore, here, we examined whether there was any correlation between the THI and the reproductive performance of Japanese Black cattle by analysing the first-service conception rates of 178,492 artificially inseminated cows across 9,833 herds in south-western Japan over a 3-year period. The daily mean (±SD) THI over the study period was 63.6 ± 11.3 (range: 41.4-81.5). The calving to first artificial insemination (AI) interval was significantly negatively correlated with THI in the month of AI (r = -.75, p < .001), whereas conception rate to first AI (CRFA) showed a cyclical change that did not correspond with that of THI, resulting in a time lag between CRFA and THI in the month of AI. Furthermore, there was a stronger correlation between CRFA and THI between 3 and 2 months before AI (r = .76 vs. .83, p < .001) than in the month of AI (r = .34, p = .04). Therefore, this extensive field study showed that a decrease in THI was associated with declined reproductive performance in Japanese Black cattle and that the impact of the cold environment on the conception rate is attributable to a carryover effect from the cold season before AI rather than conditions at the time of AI.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impaired reproduction in Japanese Black cattle under cold environmental conditions

Nabenishi

Yamazaki

2017

Reprod Domestic Animals

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“…FS of Japanese Black heifers in Okinawa was 36.33 days and slightly longer than the average reported for the Rubia Gallega breed (30.60 days) [15]. The IN of Jap anese Black cows has been 1.41 [16], whereas it was lower than the average in the present study; on the other hand, GL was consistent with their average (288 days). In this study, AFC was 25.8 months, being longer than 24.4, 25.1, and 24.98 months, as reported [1719], and records in Okinawa prefecture between 1990 and 2009 have shown AFC at 26.93 months, being longer than in the present study [20].…”

Section: Discussionsupporting

confidence: 62%

Genetics of heifer reproductive traits in Japanese Black cattle

Setiaji

Oikawa

2020

Asian-Australas J Anim Sci

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Objective: The objective of this study was to identify environmental factors strongly asso ciated with and to estimate genetic parameters of reproductive traits in Japanese Black heifers. Methods: Data included reproduction records of Japanese Black heifers born between 2004 and 2014. First service nonreturn rate (NRR) to 56 days from first to successful insemination (FS), number of services per conception (IN), age at first calving (AFC) and gestation length were analyzed with the use of the general linear model. Genetic parameters were estimated with the use of the univariate animal model of the residual maximum likelihood. Results: Averages of reproductive traits over eleven years were assessed, and the effects of farm, year, month, artificial insemination technician and interaction of farm×year on the traits were determined. Estimated heritability of FS was very low and that of AFC was higher than that of the other traits. A close genetic relation was observed among NRR, IN, and FS; however, their heritabilities were very low. AFC shows favorable genetic correlation with IN and FS. Conclusion: Low heritabilities of most reproductive traits in Japanese Black heifers are strongly influenced by farm management practices, and that large residual variances make genetic evaluation difficult. Among the reproductive traits, AFC is potentially more useful for genetic improvement of heifer reproductive traits because it has high heritability and favorable genetic correlations with IN and FS.

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“…In a study conducted by Sasaki et al (2016) demonstrated that cows in smaller herds showed low reproductive performance than large ones. Likewise, Singh et al (2016) found that the herd size had significant effect on days open as the small farms were having the maximum days open 112 days followed by the medium and large farms.…”

Section: Introductionmentioning

confidence: 99%

Effect of Herd size on the Productive, Reproductive, and Economic Efficiency of Holstein Dairy Cows

El-Tahawy¹

2017

AJVS

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Key words:Holstein cows, Herd size, Economic, Productive, Efficiency A total of 8426 dairy records were randomly selected from 11 dairy herds which had been accepted the request to participate in this study to explore the influence of herd size on the productivity and economic efficiency of the Holstein dairy cows. Records were collected during the period started from 1 st January 2016 to 30 January 2017. The localities which the dairy farms were located are El-Beheira, Alexandria and Kafr ElSheik provinces. All the investigated farms were belonged to the private management system. Herd size was classified into three categories: small (from 100 to 500 cow), medium (501 to 900 cows), and (more than 900). The obtained results showed that total milk yield of the medium size herd (5001-900 cow) was significantly (10080.02±55.51 kg; P<0.05) greater than the herd size for small and large size herd which yielded 8232.79±100.32 kg and 9380.60±58.89 kg, respectively. However, 305-milk yield of large herd size was significantly (8743.95±44.23 kg; P<0.05) greater than the comparable small and medium size herds. In terms of the reproductive performance, small and medium size herds required number of service per conception more than (3.36±0.08 and 3.53±0.06; P<0.05) the large herd size. In terms of the return parameters, total returns and net return of medium size herd were greater than those for small and large size herd.

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Reproductive performance of Japanese Black cattle: Association with herd size, season, and parity in commercial cow-calf operations

Cited by 31 publications

References 20 publications

Impaired reproduction in Japanese Black cattle under cold environmental conditions

Impaired reproduction in Japanese Black cattle under cold environmental conditions

Genetics of heifer reproductive traits in Japanese Black cattle

Effect of Herd size on the Productive, Reproductive, and Economic Efficiency of Holstein Dairy Cows

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