Comparison of Two Timed Artificial Insemination (TAI) Protocols for Management of First Insemination Postpartum

Jordan, Ellen R.; Schouten, M.J.; Quast, Jan; Belschner, A.P.; Tomaszewski, Michael A.

doi:10.3168/jds.s0022-0302(02)74160-x

Cited by 16 publications

(18 citation statements)

References 20 publications

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“…This illustrates that an increase in temperature, relative humidity, sunshine radiation and THI, could lead to lengthen DP and ICP by several days (Table 4). Similar findings were reported by Du Bois and Williams (1980), Weller and Folman (1990), Ray et al (1992), Bouraoui et al (2002), Jordan et al (2002), Mishra and Joshi (2009) and Gaafar et al (2011). Thus, calving schedules could be adjusted to minimize the adverse effect of heat stress.…”

Section: Effect Of Climatic Variables On Dry Period and Inter Calvingsupporting

confidence: 89%

Effect of macroclimatic factors on milk production and reproductive efficiency of Holstein Friesian Deoni crossbred cows

Zewdu¹,

Thombre²,

Bainwad³

2014

J. Cell Anim. Biol.

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This study was undertaken to evaluate the effects of different macro climatic variables on milk production and reproduction efficiency of Holstein Friesian × Deoni crossbred cows. Data of 256 HF × Deoni crossbred cows with 1485 total records of lactation and the meteorological data over a 30-year period (1981 to 2010) were obtained from Marathwada Agricultural University Cattle Cross Breeding Project and the University Meteorological Observatory Weather Station, respectively. The parameters used as indicators of milk production and reproduction performance in this study were lactation milk yield, lactation length, dry period and inter calving period. They were plotted against the monthly climatic variable for regression analysis. It was observed that maximum temperature, maximum humidity, bright sunshine hours and maximum temperature humidity index exhibited negative and significant regression result with lactation milk yield and lactation length. All the considered climatic variables accounted for 28 and 21% direct variation on lactation milk yield and lactation length as verified by the value of coefficients of determination (R 2 ). In contrast, maximum temperature, maximum humidity, wind speed and maximum temperature humidity index showed positive and significant regression on dry period and inter calving period. All the considered climatic variables accounted for 25 and 23% direct variation on dry period and inter calving period, respectively. The summary of the meteorological data confirmed that there were high values of temperature humidity index for considerable months yearly, which suggested that most crossbred cows were exposed to the negative effects of heat stress. Hence, other productive and reproductive strategies like improving environmental, productive and reproductive management of cows are needed to reduce the adverse effect of heat stress.

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Section: Effect Of Climatic Variables On Dry Period and Inter Calvingsupporting

confidence: 89%

Effect of macroclimatic factors on milk production and reproductive efficiency of Holstein Friesian Deoni crossbred cows

Zewdu¹,

Thombre²,

Bainwad³

2014

J. Cell Anim. Biol.

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“…These results were higher than those of some studies (37 and 39%) that use PGF 2α treatment and visual detection of estrus (14,19). Conception rate for dairy heifers receving Al at standing estrus was reported to be 47% (7) and 74% (24).…”

Section: Discussioncontrasting

confidence: 60%

“…Conception rate in this study was higher than most of the TAI protocols in dairy heifers and comparable to breeding after detection of estrus. The fact that application of AI in nulliparous heifers, early in relation to ovulation results in high proportion rate (53.8-58%) of female calves in previous (23, 27) and present study, even though a previous study suggested to be expected less female gender ratio, approximately of 45.8 % (14). In agremeent to this result, increasing the interval from TAI to ovulation in lactating cows has been reported to increase female ratio (24).…”

Section: Discussioncontrasting

confidence: 56%

Conception rate following timed artificial insemination protocols in dairy heifers synchronised by PGF2α and GnRH

;MECİTOĞLU¹

2011

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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Summary:This study aimed to develop a timed artificial insemination (TAI) protocol using PGF 2α and GnRH with acceptable pregnancy rate in dairy heifers. Dairy heifers (n=290), aged between 13 and 26 months (mean 16.1 months), were used in this study. Heifers were synchronized with two PGF 2α administrations by 14 d intervals. After the second PGF 2α , heifers were randomly assigned into two groups. In Group 1 (n=155), GnRH was given at 56h following 2 nd PGF 2α and TAI was performed at 16-18h after the GnRH. In Group 2 (n=135), GnRH was administered at 72h after 2 nd PGF 2α , at the time of TAI. Ultrasonography was performed at both PGF 2α administrations to determine cyclicity, at the time of TAI to measure ovulatory follicle size, 7 d after TAI to determine ovulation, 31 and 62 d post-AI to determine pregnancy. Ovulatory follicle size at the time of TAI was not significantly different between groups (12.8±1.6 mm and 13.2±1.8 mm in group 1 and 2, respectively). Synchronization rate was similar in group 1 (85.2%;132/155) and in group 2 (91.1%;123/135). Conception rate (CR) at 31 d was not different in group 1 (59.8% ;79/132) and in group 2 (55.3%;68/123). Embryonic loss (7.6%; 6/79 and 7.4%; 5/68 in group 1 and 2 respectively) was not different. Gender ratio of the calves was found different between groups. Proportion of the female calves born were higher (P=0.03) in group 1 (63.3%; 38/60) than in group 2 (42.0%; 21/50). In conclusion, both protocols can be used in order to eliminate estrous detection in large dairy herds. Although GnRH administration at the time of TAI was found to be useful to reduce handling of heifers, GnRH can be applied 16-18 h before AI to achive higher female calves ratio in large dairy farms. Keywords: Dairy heifers, GnRH, PGF 2α , timed artificial insemination, synchronization. PGF 2α ve GnRH Kullanılarak Senkronize Edilen Düvelerde Zaman Ayarlı SuniTohumlama Sonrasmda Elde Edilen Gebelik OranlarıÖzet: Bu çalışmanın amacı GnRH ve PGF 2α kullanılarak senkronize edilen düvelerde, östrüs kontrolleri yapılmadan uygulanan zaman ayarlı suni tohumlama sonrasında istenilen düzeyde gebelik oranı elde etmekti. Çalışmada yaşları 13 ile 24 ay arasında değişen (ortalama 16.1) düveler (n=290) kullanıldı. Düveler 14 gün ara ile uygulanan PGF 2α ile senkronize edildi ve ikinci PGF 2α uygulaması sonrası rastgele iki gruba ayrıldı. Grup l'e (n=155) ikinci PGF 2α uygulamasını takiben 56. saat GnRH ve GnRH uygulamasını taiben 16-18. saat zaman ayarlı suni tohumlama yapıldı. Grup 2'ye ise (n=135) ikinci PGF 2α uygulamasını takiben 72. saatte suni tohumlama GnRH ile birlikte uygulandı. Ovaryumların siklik olup olmadığını belirlemek amacıyla her iki PGF 2α uygulaması sırasında, ovaryumlarda folliküllerin çapını belirmek amacıyla suni tohumlama ile eş zamanlı olarak, ovulasyon oranını belirlemek amacıyla suni tohumlamayı takiben 7. gün, gebelik oranını belirlemek amacıyla suni tohumlamayı takiben 31 ve 62. günlerde ultrasonografi uygulaması yapıldı. Suni tohumlama ile eş zamanlı olarak belirlenen follikül ça...

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“…Although the present study had a power of 70% (α = 0.05, β = 30%), the probability of a type II error must be considered, as the likelihood of detecting treatment effects may be limited by the number of cows enrolled in the study. In a study utilizing modified targeted breeding (PGF 2α 14 d before GnRH, followed 7 d later by PGF 2α , detection of estrus and AI, with cows not observed in estrus receiving timed AI at 72 h), Jordan et al (2002) suggested that fertility was reduced in cattle not observed in estrus and receiving timed AI (without administration of GnRH) 72 h after PGF 2α .…”

mentioning

confidence: 99%

Short Communication: Conception Rates Following Detection of Estrus and Timed AI in Dairy Cows Synchronized Using GnRH and PGF2

Dalton

Manzo

Ahmadzadeh

et al. 2005

Journal of Dairy Science

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The objective of this study was to compare conception rates of cows exhibiting spontaneous estrus and receiving artificial insemination (AI) before completion of a timed AI protocol with cows that did not display estrus spontaneously, but were inseminated after 1 of 3 GnRH-PGF2alpha protocols. Cows (n = 432) in 2 herds were administered GnRH on d -7 and were tail-chalked daily. Cows detected in estrus before d 0 were inseminated immediately. Cows not detected in estrus by d 0 were administered PGF2alpha and were tail-chalked daily until 48 h after PGF2alpha. Cows detected in estrus from d -7 to 48 h after PGF2alpha were inseminated and designated as treatment A (n = 46). Cows not detected in estrus and not inseminated by 48 h after PGF2alpha were assigned randomly to receive either GnRH 48 h after PGF2alpha and timed AI 16 h later (treatment B; n = 132), or GnRH and timed AI 64 h after PGF2alpha (treatment C; n = 127), or timed AI 64 h after PGF2alpha (treatment D; n = 127). Pregnancy was diagnosed 38 to 45 d after AI by palpation per rectum of uterine contents. Nearly 11% of all cattle exhibited spontaneous estrus and received immediate AI. Herd did not influence the percentage of cows detected in estrus and inseminated. Conception rates did not differ among treatments. Conception rates differed between herds, but no interaction of herd x treatment was detected. No differences were detected between herds for days in milk, milk production, AI service number, or parity.

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Comparison of Two Timed Artificial Insemination (TAI) Protocols for Management of First Insemination Postpartum

Cited by 16 publications

References 20 publications

Effect of macroclimatic factors on milk production and reproductive efficiency of Holstein Friesian Deoni crossbred cows

Effect of macroclimatic factors on milk production and reproductive efficiency of Holstein Friesian Deoni crossbred cows

Conception rate following timed artificial insemination protocols in dairy heifers synchronised by PGF2α and GnRH

Short Communication: Conception Rates Following Detection of Estrus and Timed AI in Dairy Cows Synchronized Using GnRH and PGF2

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