Hormonal induction of ovulation and artificial insemination in suckled beef cows under nutritional stress

Bastos, Guilherme de Medeiros; Brenner, Ricardo Heitor; Willke, Fabrı́cio Wollman; Neves, Jairo Pereira; Oliveira, João Francisco Coelho de; Bragança, José Francisco Manta; Machado, Sérgio Luiz de Oliveira; Porciúncula, Patrı́cia Marafon; Gonçalves, Paulo Bayard Dias

doi:10.1016/j.theriogenology.2003.12.005

Cited by 15 publications

(4 citation statements)

References 35 publications

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“…Weaning lasting 72 h can improve LH release and pregnancy rate during MOET programs [ 172 ]. A 96-h weaning procedure led to higher pregnancy rates in beef cattle when combined with FTAI involving GnRH, estradiol and an intravaginal device [ 173 ]. Another technique to shorten postpartum anestrus in beef cattle when performing reproductive biotechnologies is to administer estradiol.…”

Section: Beef Cattle Stress and Reproductive Biotechnologiesmentioning

confidence: 99%

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The Effect of Stress on Reproduction and Reproductive Technologies in Beef Cattle—A Review

Fernández-Novo¹,

Pérez-Garnelo

Villagrá

et al. 2020

Animals

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Researchers have contributed by increasing our understanding of the factors affecting reproduction in beef, mainly physical health and nutrition aspects, which have been main concerns during decades. Animal welfare is of outmost relevance in all animal production systems and it is strongly associated to stress. Stress responses involve endocrine, paracrine and neural systems and the consequences of this stress on the reproductive efficiency of specifically, beef cattle and bulls, need to be highlighted. We, therefore, describe the fundamentals of stress and its quantification, focusing in beef herds, reviewing the highly valuable pieces of research, already implemented in this field. We examine major factors (stressors) contributing to stress in beef cattle and their effects on the animals, their reproductive performance and the success of reproductive biotechnologies. We include terms such as acclimatization, acclimation or temperament, very relevant in beef systems. We examine specifically the management stress due to handling, social environment and hierarchy or weaning effects; nutritional stress; and thermal stress (not only heat stress) and also review the influence of these stressors on reproductive performance and effectiveness of reproductive biotechnologies in beef herds. A final message on the attention that should be devoted to these factors is highlighted.

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Section: Beef Cattle Stress and Reproductive Biotechnologiesmentioning

confidence: 99%

“…Anestrus inhibits LH release, preventing ovulation despite the presence of GnRH. Estradiol promotes LH release, improving outcomes of FTAI in beef cattle [ 157 , 173 ]. Nevertheless, estradiol administration is illegal in some countries.…”

Section: Beef Cattle Stress and Reproductive Biotechnologiesmentioning

confidence: 99%

The Effect of Stress on Reproduction and Reproductive Technologies in Beef Cattle—A Review

Fernández-Novo¹,

Pérez-Garnelo

Villagrá

et al. 2020

Animals

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“…Moreover, changes in energy reserves during the postpartum period and body condition score (BCS; i.e. 1 = emaciated and 5 = fat) at the time of breeding are also known to affect reproductive performance (Bossis et al, 2000;Ciccioli et al, 2003;de Medeiros-Bastos et al, 2004). Lactating beef cows with moderate BCS (BCS = 3) have a greater response to an oestrus induction treatment and greater pregnancy percentage than cows with poor BCS (BCS = 2; de Medeiros-Bastos et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…1 = emaciated and 5 = fat) at the time of breeding are also known to affect reproductive performance (Bossis et al, 2000;Ciccioli et al, 2003;de Medeiros-Bastos et al, 2004). Lactating beef cows with moderate BCS (BCS = 3) have a greater response to an oestrus induction treatment and greater pregnancy percentage than cows with poor BCS (BCS = 2; de Medeiros-Bastos et al, 2004). In agreement, beef cows gaining 0.90 kg of BW daily during the first 71 days postpartum had shorter anoestrus intervals (100 ± 7 days) than cows gaining only 0.45 kg/day (120 ± 7 days; Ciccioli et al, 2003).…”

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confidence: 99%

Increased body condition score through increased lean muscle, but not fat deposition, is associated with reduced reproductive response to oestrus induction in beef cows

Guzmán

González-Padilla

Garces-Yepez

et al. 2016

Animal

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Energy reserve, estimated as body condition score (BCS), is the major determinant of the re-initiation of ovarian activity in postpartum cows. Leptin, IGF-I and insulin are positively related to BCS and are putative mediators between BCS and reproductive function. However, when BCS and body composition dissociates, concentrations of these metabolic hormones are altered. We hypothesized that increasing lean muscle tissue, but not fat tissue, would diminish the reproductive response to oestrus induction treatments. Thirty lactating beef cows with BCS of 3.10 ± 1.21 and 75.94 ± 12 days postpartum were divided in two groups. Control cows (n = 15) were supplemented with 10.20 kg of concentrate daily for 60 days. Treated cows (n = 15) were supplemented equally, and received a β-adrenergic receptor agonist (β-AA; 0.15 mg/kg BW) to achieve accretion of lean tissue mass and not fat tissue mass. Twelve days after ending concentrate supplementation/β-AA treatment, cows received a progestin implant to induce oestrus. Cows displaying oestrus were inseminated during the following 60 days, and maintained with a fertile bull for a further 21 days. Cows in both groups gained weight during the supplementation period (Daily weight gain: Control = 0.75 kg v. β-AA = 0.89 kg). Cows treated with β-AA had a larger increase in BCS (i.e. change in BCS: control = 1 point (score 4.13) v. β-AA = 2 points (score 5.06; P < 0.05), as a result of muscle accretion (i.e. change in muscle depth: control 0.21 cm v. β-AA 0.97 cm; P < 0.05) but not adipose tissue (i.e. change in back fat depth; control 0.13 cm v. β-AA −0.06 cm; P < 0.05). The changes in body composition in β-AA cows were associated with a reduction in serum concentrations of IGF-I (25.4%) and leptin (27.9%), without observed changes in insulin. Ovulation and pregnancy to 1st service (P > 0.05) did not differ between groups. However, the number of cows displaying oestrus (control 13/15 v. β-AA 8/15; P < 0.05) and the percentage cycling (control 6/8 v. β-AA 3/10; P = 0.07) after progestin treatment and the pregnancy percentage at the end of the breeding period (control 13/15 v. β-AA 8/15; P < 0.05) were lower in β-AA than control cows. In summary, the increase BCS through muscle tissue accretion, but not through fat tissue accretion, resulted in a lower response to oestrus induction, lower percentage of cycling animals and lower pregnancy percentage after progestin treatment; which was associated with a decrease in serum concentrations of leptin and IGF-I.Keywords: β-AA, energy status, IGF-I, insulin, leptin ImplicationsReproductive function in postpartum beef cows is regulated by energy status and positively associated with serum concentrations of leptin, insulin and IGF-I. β-adrenergic receptor agonist (β-AA) treatment results in muscle accretion, whilst reducing fat deposition. The reduction in body fat, despite the overall BW gain, results in lower leptin and IGF-I concentrations and a suboptimal response to an oestrus induction programme and pregnancy percentage after breeding. He...

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Short-term dietary concentrate supplementation during estrus synchronization treatment in beef cows increased IGF-I serum concentration but did not affect the reproductive response

Rosales‐Torres

López-Cedillo

Hernández‐Coronado

et al. 2016

Trop Anim Health Prod

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The objective of this study was to evaluate if short-term dietary concentrate supplementation increased IGF-I serum concentration and resulted in a reproductive response during estrus synchronization treatment in non-lactating beef cows. Thirty non-lactating beef cows (Bos indicus × Bos taurus) were allocated to the same pastureland and fed native tropical grasses as a basal diet. Cows were synchronized using a 7-day CO-Synch plus controlled internal drug release (CIDR) protocol and received fixed time artificial insemination (FTAI). Cows were divided into two groups; the control group (n = 16) received 0.5 kg of concentrate/cow/day, whereas the supplemented group (n = 14) received 4.0 kg of concentrate/cow/day. The period of supplementation was 10 days from the day of CIDR insert to FTAI. The concentration of IGF-I increased (P < 0.05) in the supplemented group, while no significant changes were observed in the control group. Moreover, at the time of insemination, IGF-I serum concentrations were higher in supplemented cows compared with control cows (P < 0.05). Notably, metabolite and insulin concentrations did not differ (P > 0.05) between treatment groups or sampling day. The response to estrus induction, measured as estrus presentation, ovulation rate, and pregnancy rate, was similar between experimental groups (P > 0.05). In conclusion, our results indicated that supplementation with dietary concentrate for 10 days in non-lactating beef cows changed the endocrine milieu, specifically increasing IGF-I serum concentration. However, these endocrine changes did not affect response to estrous induction treatment.

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Hormonal induction of ovulation and artificial insemination in suckled beef cows under nutritional stress

Cited by 15 publications

References 35 publications

The Effect of Stress on Reproduction and Reproductive Technologies in Beef Cattle—A Review

The Effect of Stress on Reproduction and Reproductive Technologies in Beef Cattle—A Review

Increased body condition score through increased lean muscle, but not fat deposition, is associated with reduced reproductive response to oestrus induction in beef cows

Short-term dietary concentrate supplementation during estrus synchronization treatment in beef cows increased IGF-I serum concentration but did not affect the reproductive response

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