Goat reproductive biotechnology in Brazil

Guerra, Maria Madalena Pessoa; Silva, S.V.; Batista, André Mariano; Coleto, Zoraide Fernandes; Silva, Ellen Cordeiro Bento da; Monteiro, P. L. J.; Carneiro, Gustavo Ferrer

doi:10.1016/j.smallrumres.2011.03.033

Cited by 10 publications

(12 citation statements)

References 28 publications

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“…The lack of differences between seasons in the number of ovarian structures, as well as on recovered and transferable embryos recorded per donor, may be due to the similarity of climatic conditions in both seasons. These results, however, disagree with previous findings of goats showing a strong effect of season on sexual activity (Delgadillo et al 1999), embryo production and recovery rates (Guerra et al 2011). The lack of differences in ovarian structures between seasons of this study also differs from the results obtained in Boer goats (Chang et al 2006), with up to two more embryos recovered in autumn than in other seasons.…”

Section: Discussioncontrasting

confidence: 99%

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Effect of Three pFSH Doses on Superovulation and Embryo Quality in Goats During Two Breeding Seasons in North‐eastern Mexico

Sánchez-Dávila

Ledezma-Torres

Padilla‐Rivas

et al. 2014

Reprod Domestic Animals

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The aim of this research was to evaluate the effectiveness of three pFSH doses (80 mg; 145 mg and 215 mg) on ovarian response and on quantity and quality of transferable embryos of goats during the breeding and the non-breeding seasons. Ovary structures were exposed (laparatomy under general anaesthesia) and numbers of follicles and corpora lutea were registered. Surgical embryo flushing was conducted to count and classify embryos. There were more follicles (3.4 ± 1.1) in does administered 80 mg of pFSH (p < 0.05) than in goats administered 145 mg of pFSH (2.2 ± 1.1) and 215 mg of pFSH (0.9 ± 0.6). Numbers of corpora lutea, blastocysts, and recovered and transferable embryos of goats administered 145 mg pFSH (13.4 ± 3.7, 2.42 ± 1.0, 3.4 ± 1.2 and 3.2 ± 1.1, respectively) and those of goats administered 215 mg pFSH (11.6 ± 2.6, 3.2 ± 0.9, 5.7 ± 1.5, and 5.6 ± 1.5) were greater (p < 0.05) than values obtained from goats administered 80 mg pFSH (4.0 ± 1.5, 0.5 ± 0.3, 1.0 ± 0.5, and 0.8 ± 0.5). Numbers of morula of does administered 80 and 145 mg pFSH (0.4 ± 0.4 and 0.8 ± 0.3) were lower (p < 0.05) than those obtained from animals treated with 215 mg pFSH (2.4 ± 0.9). There was no effect of season upon the analyzed variables. In conclusion, under the prevalent conditions in north-eastern Mexico, administration of 145 or 215 mg pFSH in a decreasing dose schedule over 3.5 days to bred goats provided a satisfactory superovulatory result.

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Section: Discussioncontrasting

confidence: 99%

“…), embryo production and recovery rates (Guerra et al. ). The lack of differences in ovarian structures between seasons of this study also differs from the results obtained in Boer goats (Chang et al.…”

Section: Discussionmentioning

confidence: 99%

Effect of Three pFSH Doses on Superovulation and Embryo Quality in Goats During Two Breeding Seasons in North‐eastern Mexico

Sánchez-Dávila

Ledezma-Torres

Padilla‐Rivas

et al. 2014

Reprod Domestic Animals

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“…In Brazil, pregnancy rates of 59% by transcervical route are reported, using fresh, diluted semen at 5°C and coconut water as diluent, mainly in dairy breeds, such as Saanen. As in other countries, different protocols for estrous synchronization have been used in Brazil, such as the use of devices between 5 and seven days, reaching pregnancy rates between 60 and 73% (Guerra et al, 2011).…”

Section: Artificial Inseminationmentioning

confidence: 99%

“…A light stab action is made and one-half of the semen dose is deposited in each uterine horn at approximately 5 cm from the uterine bifurcation. In emerging countries, the use of these techniques has been directed towards evaluating the variations in time periods of AI, semen dose, sperm concentration, type of semen used (fresh, diluted, refrigerated or frozen-thawed semen), finding variable pregnancy rates ranging from 43 to 68% (Gama and Bressan, 2011;Guerra et al, 2011).…”

Section: Artificial Inseminationmentioning

confidence: 99%

“…Author(s) agree that this article remains permanently open access under the terms of the Creative Commons Attribution License 4.0 International License nutritional effect (Scaramuzzi et al, 2006) and the health effect (Cseh et al, 2012), as well as sociocultural aspects of the majority of the regions in which goats are exploited and that almost 90% of goat producers have little knowledge of new technologies (Mellado, 2008). Taking into consideration the aforementioned, the application of new technologies in small ruminants has been restricted in developing countries (Chang et al, 2006;Lehloenya and Greyling, 2010;Paramio, 2010;Gama and Bressan, 2011;Guerra et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Status and implementation of reproductive technologies in goats in emerging countries

Arredondo¹,

Gómez²,

Vázquez-Armijo³

et al. 2015

Afr. J. Biotechnol.

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In modern cattle breeding, assisted reproductive technologies in small ruminants have been used even out-of-season breeding, but in emerging countries these technologies have been mainly used for estrous synchronization and artificial insemination. However, in the last 30 years, significant progress in the matter of transfers of in vivo derived and in vitro produced embryos has been achieved. Currently, eight donor embryos are obtained by goat, due to the physiological knowledge of the presence of dominant follicles; above alter results recovered embryos (4 embryos / donor). Whereas, the goat has the advantage of presenting a shorter interval between generations compared to cow; this promote more research in in vitro fertilization, and overcome the limitations presented in a traditional embryo transfer. However cloning and transgenesis, are two techniques that will begin to have a commercial application, because goats can be used as bioreactors to produce milk with specific proteins to develop drugs. The objective of this study was to establish and describe in a general way the use of these techniques in goats, to promote their use so as to achieve genetic improvement in goats.

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