Intensity of the biostimulatory effect of bulls on resumption of ovulatory activity in primiparous, suckled, beef cows

Berardinelli, J. G.; Tauck, S.A.

doi:10.1016/j.anireprosci.2006.03.019

Cited by 17 publications

(9 citation statements)

References 8 publications

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“…The bull courtship starts late in the cow’s proestrus and the bull will smell and lick the cow’s vulva until the cows enter oestrus. The length of the exposure may have an effect as reported by Berardinelli and Tauck (2007). Primiparous beef cows when exposed to a mature bull or bull execratory products for at least 60 days period had higher conception rates (57.6%) than the non‐biostimulated cows (35.6%) when performing oestrous synchronization based on GnRH and PGF2α injection followed by TAI (Berardinelli et al.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Acute Bull Exposure Around the Time of Artificial Insemination on Serum Oxytocin and Progesterone Concentrations and Pregnancy Rates in Dairy Cows

Ababneh

Obeidat

Husein

et al. 2012

Reprod Domestic Animals

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This study examined the effect of acute bull exposure around the time of artificial insemination (AI) on oxytocin and progesterone concentrations, and pregnancy rates in dairy cows. Ninety six dairy cows, stratified according to parity into primiparous and pluriparous, were divided into three groups; short bull exposure (SBE; 10 min, n = 32), long bull exposure (LBE; 4 h, n = 32) or no bull exposure (NBE; n = 32). On day 45 post-partum, all cows were treated with PGF2α on three occasions 11-14 days apart to synchronize oestrus. They were submitted to fixed time AI 80 h after the third PGF2α injection. Cows in the SBE and LBE groups were artificially inseminated 5 min after the introduction of the bull. From a subset of cows (n = 6 per group; three primiparous and three pluriparous), blood samples were collected once every 5 min starting 15 min before AI until 15 min after AI and analysed for oxytocin concentrations. Additional blood samples were collected for measurements of progesterone (P4) concentrations once daily for 4 days starting on the day of AI and once every 3 days thereafter until day 22. The effects of bull exposure, time, parity, difficulty of AI, and pregnancy on oxytocin and P4 concentrations were analysed using the mixed linear model procedure. Mean oxytocin concentrations or change in oxytocin concentrations after bull exposure or AI were not different among groups. Pregnancy rates for the NBE, SBE and LBE groups were 55.5%, 33.3% and 44.4%, respectively, and were not different among groups. In conclusion, acute bull exposure around the time of AI did not affect oxytocin and progesterone concentrations and did not improve pregnancy rates in dairy cattle under these farms conditions.

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Section: Discussionmentioning

confidence: 99%

“…Fence line contact was not as effective as close physical contact between cows and bulls. (Berardinelli and Tauck 2007). In pigs, the presence of a ‘whole boar’ resulted in better oestrus expression than all artificial stimuli (Gerritsen et al.…”

Section: Discussionmentioning

confidence: 99%

Effect of Acute Bull Exposure Around the Time of Artificial Insemination on Serum Oxytocin and Progesterone Concentrations and Pregnancy Rates in Dairy Cows

Ababneh

Obeidat

Husein

et al. 2012

Reprod Domestic Animals

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“…However, they exposed the cow with bull's urine (treatment group) and with water (control group) instead of the exposure of cows directly with bull. Undoubtedly the, stimulatory effect of bull is also influenced by the intensity of contact (the frequency of contact, duration of contact as well as the quantity of stimuli) of pheromones fabricated by bulls [5] .…”

Section: Discussionmentioning

confidence: 99%

“…A postpartum cow exposed to bull by physical contact or separated by fence-line [5] results in an early ovarian activity. This phenomenon is called as "biostimulatory effect of bull" and is interacted by pheromones secreted in the environment through the excretory products of male [3] .…”

Section: Introductionmentioning

confidence: 99%

Cholistani İneklerde Boğa Maruziyetinin Doğum-sonrası Üreme Etkinliği Üzerine Etkisi

Akhtar¹,

Hussain²,

Ayaz³

et al. 2015

Kafkas Univ Vet Fak Derg

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The present study was conducted with the objective to determine the effect of bull exposure on postpartum resumption of ovarian activity, first behavioural oestrus and conception rate in Cholistani cows. A total of 24 Cholistani cows kept at Shadabad Cooperative Livestock Farms Cholistan, Pakistan during September-2012 to January-2013, were divided into two groups. Bull exposed (BE) cows (n=18) were exposed to mature bull throughout the study period whereas bull not exposed (BNE) cows (n=6) were not. Both groups were kept under similar feeding and management conditions. The mean interval from the calving to resumption of ovarian activity was 39.75±3.19 days in the BE and 49.75±2.75 days in BNE animals (P<0.05). The mean interval from the calving to the first behavioural oestrus was 46.93±0.48 days in BE and 57.5±1.29 days in BNE animals (P<0.05). During the study period, more (P<0.05) cows from the BE group (16/18 = 88.88%) showed behavioural oestrus as compared to the BNE group ones (4/6=66.66%). The conception rate in BE and BNE cows were 66.66% and 33.33%, respectively (P<0.05). It was concluded that, cows exposed to the presence of bulls at early postpartum periods showed reduced intervals from the calving to resumption of ovarian activity, first behavioural oestrus and resumed cyclicity earlier. Keywords

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“…Subsequent findings that close physical contact between cows and bulls enhanced the biostimulatory effects added another factor to this mechanism, thus, the intensity of the stimuli (i.e. frequency, duration of exposure, and quantity of the stimuli) provided by the bull is integral (Berardinelli and Tauck, 2007). Hence, failure of biostimulatory response in studies that utilized intermittent contact (Fernandez et al, 1996) and fence line contact across a 6-8 m alleyway Ellis, 1998, 1999) could have been caused by less intensity of signal from the bulls.…”

Section: Biostimulationmentioning

confidence: 99%

Evaluation of weaning regimen and seminal plasma biology on reproductive management in cattle

Odhiambo¹

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The goal of any reproductive management system in cattle is to ensure that cows breed at the earliest opportune time and maintain their pregnancy to term. However, delayed resumption of postpartum ovarian cyclic activity in primiparous beef cows and pregnancy losses in dairy cows continue to impede progress in obtaining sound reproductive efficiency in these species. Three studies were designed to test the following hypotheses: 1) Does removal of lactational stress in beef cows by early weaning of calves improve cow energy profile and postpartum reproductive performance? 2) Does artificial insemination (AI) with adjunctive seminal plasma (SP) or transforming growth factor beta-1 (TGF-β1) improve conception rates in lactating dairy and beef cows? 3) Does seminal plasma of dairy bulls differ in expression of proteins that might be used as potential biomarkers of male fertility? In experiment 1, pregnant and lactating beef cows (n = 408) were assigned randomly to wean calves either at 180 d of age (early weaning) or 45 d later (normal weaning). Body energy status was evaluated by periodic measurements of body weight (BW), body condition score (BCS), rib and rump fat. Reproductive performance was determined by calving intervals (CI), intervals from breeding to calving (BCI), retention in herd, and adjusted 205-d weaning weight of the subsequent calf. In experiment 2, lactating beef (n = 1090) and dairy (n = 800) cows received 0.5 mL SP, 40 ng recombinant human TGF-β1, or 0.5 mL bovine serum albumin (BSA) or were left untreated at insemination. Pregnancy was determined by transrectal ultrasonography 35 to 40 d post insemination or from records of calves born in the subsequent calving season. In experiment 3, seminal plasma from high (n = 8) and low (n = 6) fertility bulls at Select Sires Inc. (Plains City, OH) were assayed for TGF-β1 content, and subsequently analyzed by 2-D fluorescence difference gel electrophoresis (2-D DIGE) for presence of potential biomarkers of male fertility. Early weaning and cow age improved (P < 0.001) energy partitioning and production efficiency in beef cows. Rump fat measurements predicted body energy status better than BW or BCS (P < 0.001). Inseminations with SP and/or TGF-β1 numerically increased (P = 0.07) conception rates in beef and dairy cows. Concentrations of TGF-β1 in seminal plasma were numerically greater (P = 0.25) in high fertility dairy bulls than those of low fertility. Expression of fertility associated proteins did not differ (P > 0.05) between high and low fertility bulls. However, their expression patterns were altered by semen processing. In conclusion, reproductive efficiency in primiparous beef cows can be improved by removal of lactational stress during mid to late pregnancy, while in dairy cows inseminations with adjunctive SP and/or incorporation of some seminal plasma proteins into semen during processing might improve conceptions rates after AI. iii DEDICATION This dissertation is dedicated to my departed sister, Ms. Lillian Achieng whom I'll always miss dearly.

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Intensity of the biostimulatory effect of bulls on resumption of ovulatory activity in primiparous, suckled, beef cows

Cited by 17 publications

References 8 publications

Effect of Acute Bull Exposure Around the Time of Artificial Insemination on Serum Oxytocin and Progesterone Concentrations and Pregnancy Rates in Dairy Cows

Effect of Acute Bull Exposure Around the Time of Artificial Insemination on Serum Oxytocin and Progesterone Concentrations and Pregnancy Rates in Dairy Cows

Cholistani İneklerde Boğa Maruziyetinin Doğum-sonrası Üreme Etkinliği Üzerine Etkisi

Evaluation of weaning regimen and seminal plasma biology on reproductive management in cattle

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