Effects of environmental factors on multiple ovulation of zebu donors

Peixoto, Maria Gabriela Campolina Diniz; Bergmann, Jose Aurélio García; Fonseca, C. G.; Penna, V. M.; Pereira, Cláubia

doi:10.1590/s0102-09352006000400019

Cited by 9 publications

(7 citation statements)

References 12 publications

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“…The number of ova/embryos recovered (10.1±1.2) was close to that of Brazilian Nelore cattle (10.2±7.8) (Peixoto et al 2006). In general, the embryo viability rate in Brazilian cattle is 50% and for the study farm was 64.0±5.0%, which was especially good.…”

Section: Discussionsupporting

confidence: 59%

Human–animal interaction, stress, and embryo production in Bos indicus embryo donors under tropical conditions

Macedo

Zúccari

Abreu

et al. 2011

Trop Anim Health Prod

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This study investigated the effect of human-animal interaction (HAI) and the stress response on the quality of embryo production in superovulated Nelore (Bos indicus) cattle, under tropical conditions. Thirty-two females underwent a superovulation protocol for 5 days. Cortisol concentrations were determined in blood plasma collected on days 0, 4, and 5. Artificial insemination was performed on days 4 and 5, and nonsurgical embryo flushing on day 11. Embryo production and viability were determined. Human stimulation, animal behaviors, accidents, and handling time were recorded to assess HAI. Cattle age was negatively correlated with accidents, frequency of aversive behaviors, and negative stimuli by stockperson during transit through corral compartments to receive superovulation treatments. The factor analysis revealed two distinct groups. The first group was called stressed and had higher cortisol concentration than the nonstressed group, 16.0 ± 2.1 and 12.5 ± 1.0 ng/mL, respectively. Comparisons between these groups showed that the frequency of voice emissions by the stockperson and the number of accidents were higher in the stressed group, and also, the mean handling time was longer in the stressed group than for the nonstressed. As a result, viability rate of the embryos was 19% lower in the stressed group (P < 0.05). This indicates that intensive negative HAI is likely related to stress, which affects embryo production in a superovulation program.

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Section: Discussionsupporting

confidence: 59%

Human–animal interaction, stress, and embryo production in Bos indicus embryo donors under tropical conditions

Macedo

Zúccari

Abreu

et al. 2011

Trop Anim Health Prod

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“…The mean number of ovulatory follicles in the current study ranged from 7.7 to 13.7. This was like those observed by Peixoto [22] ranging between 7.3 and 13.8 and higher than those of Hahn (1990) who observed a range of 3 -10 follicles [5]. Despite the large number of ovulatory follicles, not all ovulated.…”

Section: Discussionsupporting

confidence: 86%

Alternative Follicle Stimulating Hormone Dose Rate for Embryo Production in Dairy Cattle

Kios

2019

JDVS

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Multiple ovulation and embryo transfer though available for the past 40 years, is seldom used in Kenya. The high cost of superovulation has been cited as a major contributory factor. The research was carried out to test the effect of four different dose rates of follicle stimulating hormone (FSH) used for superovulation. Ultrasound and manual palpation were used to determine the number of follicles and corpora lutea formed. Harvesting and grading of embryos was carried out to determine the quantity and quality of embryos produced. An average of three embryos per donor was recovered, though there was a potential of more than six embryos. One third of the donors failed to ovulate, another third produced 1 to 3 embryos while a third produced over three embryos. All donor cows had several ovulatory follicles ranging from 7.7 to 13.7, but the failure for some to ovulate needs further investigation. There was no difference in embryo quantity and quality between the different FSH dose rates. The season, technique and animal factors were shown to influence embryo production. It's recommended that super ovulation may be carried out in Kenya using 200 mgs of FSH. This will reduce the cost of embryo production by at least 25% or more depending on the number of embryos harvested per donor.

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“…Adotou-se essa divisão entre doadoras mais jovens e mais velhas porque fêmeas bovinas podem alcançar a maturidade ovariana entre 5 e 8 anos de idade (Peixoto et al, 2006). Para se verificar o efeito da estação do ano, consideraram-se as sessões OPU realizadas na estação chuvosa (entre outubro e março, 232 aspirações), e na estação seca (entre abril e setembro, 202 aspirações).…”

Section: Methodsunclassified

Parâmetros da produção in vitro de embriões da raça Sindi

Mello

Sousa

et al. 2016

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar os efeitos da doadora, estação do ano, do touro e do tipo de sêmen, na produção in vitro de embriões da raça Sindi (Bos indicus). Para isso, avaliaram-se 434 sessões de aspiração folicular in vivo (OPU), realizadas em 152 doadoras, com a utilização de sêmen sexado e não sexado de 22 touros. Analisaram-se as seguintes variáveis: doadora; idade da doadora; estação do ano; touro; tipo de sêmen; oócitos recuperados; viáveis e degenerados; e as taxas de clivagem e de blastocistos. Observaram-se efeitos da doadora e do touro sobre os oócitos recuperados, viáveis e degenerados e sobre a taxa de blastocisto. O ano foi dividido em estações chuvosa, de outubro a março, e seca, de abril a setembro. Na estação chuvosa, a proporção de oócitos viáveis aumentou, enquanto a de degenerados diminuiu. As doadoras com menos de seis anos tiveram maior proporção de oócitos viáveis e menor, de degenerados. O sêmen não sexado obteve as melhores taxas de clivagem e de blastocistos. Doadoras de até seis anos apresentam a maior proporção de oócitos viáveis, e o maior número de oócitos viáveis é produzido na estação chuvosa. O sêmen não sexado resulta em melhores taxas de clivagem e de blastocistos.Termos para indexação: Bos indicus, doadora, OPU, sazonalidade, sêmen. Parameters of in vitro embryo production of the Sindhi breedAbstract -The objective of this work was to evaluate the effects of donor, season of the year, sire, and type of semen on in vitro embryo production of the Sindhi breed (Bos indicus). To this end, 434 in vivo ovum pick up (OPU) sessions, performed in 152 oocyte donors, were evaluated using sex-sorted or unsorted semen from 22 sires. The following variables were analyzed: donor; age of the donor; season of the year; sire; type of semen; recovered, viable, and degenerated oocytes; and cleavage and blastocyst rates. The effects of the donor and sire were observed on recovered, viable, and degenerated oocytes, and on blastocyst rates. The year was split into rainy season, from October to March, and dry season, from April to September. In the rainy season, the proportion of viable oocytes increased, while the proportion of the degenerated ones reduced. Donors with less than six years of age had a higher proportion of viable oocytes and a lower proportion of degenerated ones. Unsorted semen obtained the best cleavage and blastocyst rates. Donors with up to six years of age show the greatest proportion of viable oocytes, and the greatest number of viable oocytes is produced during the rainy season. Unsorted semen shows the best rates for cleavage and blastocysts.

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Effects of environmental factors on multiple ovulation of zebu donors

Cited by 9 publications

References 12 publications

Human–animal interaction, stress, and embryo production in Bos indicus embryo donors under tropical conditions

Human–animal interaction, stress, and embryo production in Bos indicus embryo donors under tropical conditions

Alternative Follicle Stimulating Hormone Dose Rate for Embryo Production in Dairy Cattle

Parâmetros da produção in vitro de embriões da raça Sindi

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