Evaluation of Systematic Breeding Programs for Lactating Dairy Cows: A Review

Nebel, R.L.; Jobst, S.M.

doi:10.3168/jds.s0022-0302(98)75679-6

Cited by 99 publications

(56 citation statements)

References 24 publications

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“…This might have been one of the causes of the low conception rate. Previous studies also reported that the conception rate at 50 to 75 d postpartum at initiation of Ovsynch was lower than the figure at 76 d postpartum [57,58].…”

Section: Factors Affecting the Conception Rate After Ovsynch/ Taimentioning

confidence: 96%

Development of Ovulation Synchronization and Fixed Time Artificial Insemination in Dairy Cows

Yamada¹

2005

J. Reprod. Dev.

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Abstract.Recently, reproductive management has become more difficult as a result of increased herd size. Problems with missing estrous signs and decrease in conception rate by artificial insemination (AI) performed at wrong timing have caused low AI conception rates. In 1995, ovulation synchronization and fixed-time AI (Ovsynch/TAI) was developed in the USA as a new reproductive technology, which was accepted as an useful reproductive management tool in many countries. However, no information on the use of Ovsynch/TAI was available in Japan. It was, therefore, warranted to show the ovulation rate and conception rate after Ovsynch/TAI using gonadotropin releasing hormone analogue (GnRH-A, fertirelin acetate) and prostaglandin F2α (PGF2α)-THAM, both were commercially available in this country. The conception rate after Ovsynch/TAI has been known to vary among different herds and individuals. Investigation and analysis of factors affecting the conception rate was also warranted to improve the conception rate. A series of experiments were carried out to establish Ovsynch/TAI using domestically produced GnRH-A and PGF2α and to study factors affecting conception rate after Ovsynch protocol. Ovsynch using 100 µg GnRH-A and 25 mg PGF2α were observed using ultrasonography. As a result, a high synchronization rate of ovulation at 16 to 20 h after the second GnRH injection was confirmed. The conception rate after Ovsynch/TAI was compared in 87 cows with the conception rate after AI at estrus induced by PGF2α (139 cows). Conception rate after Ovsynch/TAI was higher than the figure after AI at induced estrus (59.1% vs 20.9%, P<0.05). The dose of GnRH-A was also studied and a practical dose of GnRH-A was found to be 50 µg per cow. To clarify some factors affecting the conception rate after Ovsynch/TAI, 1,558 cows were investigated for the state of their ovaries, days after calving, parity, season, ovarian cyclicity postpartum and nutritional state at the day of Ovsynch. The overall conception rate after Ovsynch/ TAI was 51.5%. Fifty-six cows (3.6%) showed estrus at 6 to 7 d after the first injection of GnRH-A. The conception rate after Ovsynch/TAI was low in cows that were 40 to 60 d postpartum, those in their 5th lactation or more, those bred in July to August, and those recovering ovarian cyclicity later than 56 d postpartum. The conception rate after Ovsynch/TAI was high in cows in which body condition score (BCS) was 3.75 at dry period and 3.0 at the day of Ovsynch. In conclusion, Ovsynch/TAI is an effective tool for the reproductive management of dairy cows. A steady and sufficient conception rate after Ovsynch/TAI could be expected by taking the factors affecting the conception rate into the consideration. Key words: Artificial insemination, Dairy cow, Estrus, Ovulation synchronization (J. Reprod. Dev. 51: [177][178][179][180][181][182][183][184][185][186] 2005) here are about 1,730,000 dairy cattle in Japan and half of the cattle for breeding are in Hokkaido. Nakashunbetsu, a town in the Nemuro district of Hokkaido,...

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Section: Factors Affecting the Conception Rate After Ovsynch/ Taimentioning

confidence: 96%

Development of Ovulation Synchronization and Fixed Time Artificial Insemination in Dairy Cows

Yamada¹

2005

J. Reprod. Dev.

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“…Well managed and profitable dairy farming requires animal with good reproductive performance (Nebel and Jobst, 1998). However, various reports of decreasing profit in dairy farming have been identified where improvements can be made (Bishop, 1964).…”

Section: Introductionmentioning

confidence: 99%

Bacterial Pathogens and Antibiotic Susceptibility Patterns of Cervico-Vaginal Discharges in Cross Bred Repeat Breeding Heifer Cows

Ahuja¹,

Cheema²,

Narang³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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“…In our country, dairy can be an important sector for rural development and poverty alleviation. Reproductive efficiency is essential for profitable dairy farms (Nebel and Jobst, 1998). Economy of dairy farming largely depends on good conception rates after insemination.…”

Section: Introductionmentioning

confidence: 99%

Prevalence of Repeat Breeding and Its Effective Treatment in Cows at Selected Areas of Bangladesh

Asaduzzaman¹,

Bhuiyan²,

Rahman³

et al. 2017

Bangl. J. Vet. Med.

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ASTRACTThe objectives of the study were to determine the prevalence of repeat breeding and its associated risk factors in cows at selected areas of Bangladesh followed by determination of an effective treatment regime for those cows. Data were collected by interviewing the owner of the cows from 172 farms having 1524 breedable cows located at one Upazila of Mymensingh, Chittagong, Khulna, Satkhira, Bogra and Dhaka districts. A total of 122 repeat breeding cows were treated and randomly distributed into 5 experimental groups for different treatment regimes. The treatment regimes were (i) single AI with injection of 500 µg of gonadorelin, (ii) intra uterine infusion of 4.0 million i.u. penicillin daily for 3 days followed by single AI at next estrus, (iii) same time AI with double doses of semen, (iv) two times AI at 8 hours interval and (v) single AI without any intervention (used as control group). Information was collected for all treated cows for returning to estrus at 20-22 days post-AI. If the cow did not return to estrus at 20-22 days post-AI, the cows were examined for pregnancy by per rectal palpation of genital tract at 60-90 days post-AI. The pregnancy of the treated cows was used as the indicator of success of each treatment regime. The overall prevalence of repeat breeding in cows was 11.5%. The breed of cows, herd BCS and farm size influenced the prevalence of repeat breeding in cows. The age, parity, BCS and milk yield influenced the occurrence of repeat breeding in individual cows. The significantly higher proportion of cows recovered when AI was done using double doses of semen (52.8%) or single AI was done with GnRH administration (51.9%) than no intervention control (30.4%). In conclusion, repeat breeding cows may be inseminated with double doses of semen or with single AI with GnRH administration for improvement of conception.

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Evaluation of Systematic Breeding Programs for Lactating Dairy Cows: A Review

Cited by 99 publications

References 24 publications

Development of Ovulation Synchronization and Fixed Time Artificial Insemination in Dairy Cows

Development of Ovulation Synchronization and Fixed Time Artificial Insemination in Dairy Cows

Bacterial Pathogens and Antibiotic Susceptibility Patterns of Cervico-Vaginal Discharges in Cross Bred Repeat Breeding Heifer Cows

Prevalence of Repeat Breeding and Its Effective Treatment in Cows at Selected Areas of Bangladesh

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