Association of interservice interval with conception rate in Japanese Black cattle

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

doi:10.1111/rda.13191

Cited by 7 publications

(4 citation statements)

References 6 publications

(6 reference statements)

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“…Resynchronization facilitates greater use of TAI, which is favourable to allow for cross‐breeding, replacement of genetically superior matrices, greater standardization of batches of calves and reduction in the amount of bulls needed. Our results along with the study by Irikura et al, (, ) suggest that future studies on resynchronization, followed by a third AI treatment under tropical conditions, could also aid in maximizing the reproductive efficiency.…”

Section: Discussionsupporting

confidence: 75%

“…Previous research (Irikura, Uematsu, Kitahara, Osawa, & Sasaki, , ) showed an increase in pregnancy rate after a third artificial insemination (AI). Resynchronization facilitates greater use of TAI, which is favourable to allow for cross‐breeding, replacement of genetically superior matrices, greater standardization of batches of calves and reduction in the amount of bulls needed.…”

Section: Discussionmentioning

confidence: 99%

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Effect of oestrous resynchronization on the reproductive efficiency of zebu cows

Faleiro

Neves

Pereira

et al. 2019

Reprod Domestic Animals

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The aim of this study was to develop a resynchronization strategy before the return of oestrus in cows diagnosed as not pregnant after fixed‐time artificial insemination (TAI). A total of 839 cows, approximately 45 days post‐partum, were synchronized using TAI. On day 0, intravaginal progesterone‐releasing devices were inserted and 2 mg of oestradiol benzoate was administered. Eight days later (D8), the progesterone‐releasing devices were removed and oestradiol cypionate (0.5 mg, eCG [300 IU]) and prostaglandin (7.5 mg) were administered. All cows were inseminated between 48 and 56 hr after device removal (D10). Thirty days after TAI, cows that were not diagnosed as pregnant by ultrasound were immediately resynchronized and again inseminated at a fixed time. The hormonal protocol used in the first and second rounds of TAI was the same. The pregnancy rate after the first TAI was 52%, and after the second TAI, it was 49%. The increase in the total pregnancy rate (synchronization + second oestrous synchronization) compared to a single synchronization was 23.5%. In conclusion, resynchronization of oestrus and ovulation in zebu cows that had previously undergone TAI protocols is effective in increasing the reproductive efficiency.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Effect of oestrous resynchronization on the reproductive efficiency of zebu cows

Faleiro

Neves

Pereira

et al. 2019

Reprod Domestic Animals

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“…Epidemiological observational studies are suitable for analyzing the factors that hinder productivity or reproductive performance [36]. There are several reports about Japanese Black cows [28, 29, 41]; however, very few reports have concretely elucidated such factors using dairy cows from a local prefectural unit in Japan.…”

mentioning

confidence: 99%

Association of postpartum diseases occurring within 60 days after calving with productivity and reproductive performance in dairy cows in Fukuoka: A cow-level, retrospective cohort study

et al. 2019

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Peripartum disorders in dairy cows negatively influence their productivity and reproductive performance. However, only a few reports have clearly indicated the influence of such disorders on the productivity and reproductive performance at a local-area or cow-level in Japan. This study aimed to elucidate the influence of diseases occurring within 60 days after calving on subsequent productivity and reproductive performance. Accordingly, a wide-area database on dairy production was used for epidemiological analysis; subsequently, multivariable analysis was performed to investigate the association of such diseases with productivity or reproductive performance in 6,545 cows from 178 farms in Fukuoka. We used 305-day energy-corrected milk (305 ECM) as an index of productivity and conception and culling as indices of reproductive performance. With regard to causality, mixed-effects model was used for analyzing the association between disease and productivity, and Cox proportional hazard model was used for analyzing the association between disease and reproductive performance. Compared to the disease absence group, the disease presence group demonstrated significantly lower 305 ECM [−154 kg; 95% confidence interval (CI), −229 to −79] and risk of pregnancy [hazard ratio (HR), 0.85; 95% CI, 0.80–0.91] and higher risk of culling (HR, 1.36; 95% CI, 1.17–1.59). These results indicate that, in Fukuoka, dairy cows affected by diseases within 60 days after calving exhibit lower productivity and reproductive performance. Therefore, proper dairy cow management during the peripartum period to prevent diseases during early lactation may maintain or improve productivity.

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“…Because cattle grazing is not performed in this region, the calves were fed roughage such as rice straw, Italian ryegrass, oat straw, and a dietary concentrate twice daily. The average productivity for Japanese Black cattle has been previously reported [ 10 , 11 , 14 , 21 , 27 ].…”

Section: Methodsmentioning

confidence: 99%

Economic loss due to treatment of bovine respiratory disease in Japanese Black calves arriving at a backgrounding operation in Miyazaki

Sasaki

Iki

Anan

et al. 2022

The Journal of Veterinary Medical Science

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The present study assessed the economic loss due to treatment of bovine respiratory disease (BRD) in Japanese Black calves that were introduced to a backgrounding operation from the age of 3 to 4 months until the age of 10 months. The data collected from a backgrounding operation in Miyazaki, Japan included the records of 2,690 animals entering the farm from 2013 to 2018. The treatment duration was defined as the number of days from the beginning to end of treatment. The cost of treatment was defined as the total cost of treatment during the treatment duration. The average incidence of BRD was 54.6%, and the relative frequency of calves that had BRD once, twice, and three or more times until they left the farm was 64.4%, 26.8%, and 8.8%, respectively (total recorded diagnoses of BRD: 2,494). Among the 2,494 recorded diagnoses, the average and median duration of treatment of BRD was 5.9 days and 3.0 days, respectively. The average and median cost of treatment was 7,767 and 5,600 Japanese yen, respectively. A prolonged duration of treatment and high cost of treatment were associated with BRD relapse, steers, and early stage of production (P < 0.05). At the studied farm, the total cost of treatment during the 6-year study period was 19,658,988 yen, and the annual cost was approximately 3 million yen. In summary, the present study showed that BRD had a large economic impact in this backgrounding operation.

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Association of interservice interval with conception rate in Japanese Black cattle

Cited by 7 publications

References 6 publications

Effect of oestrous resynchronization on the reproductive efficiency of zebu cows

Effect of oestrous resynchronization on the reproductive efficiency of zebu cows

Association of postpartum diseases occurring within 60 days after calving with productivity and reproductive performance in dairy cows in Fukuoka: A cow-level, retrospective cohort study

Economic loss due to treatment of bovine respiratory disease in Japanese Black calves arriving at a backgrounding operation in Miyazaki

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