Recent advances in superovulation of cattle

Armstrong, David T.

doi:10.1016/0093-691x(93)90021-v

Cited by 141 publications

(58 citation statements)

References 80 publications

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“…Therefore, it is necessary to obtain embryos from cows that underwent superovulation treatment in an efficient manner. However, superovulated cows exhibit large individual differences in terms of the embryo collection results [1,2]. For example, it has been reported that when Holstein cows receive superovulation treatment, four or more normal embryos can be obtained from a significantly higher ratio of heifers with at least 90 mg/dl and multiparous cows with at least 130 mg/dl of serum total cholesterol than cows with lower levels of serum total cholesterol [3].…”

mentioning

confidence: 99%

Relationship between Embryo Collection Results after Superovulation Treatment of Japanese Black Cows and Their Plasma β-carotene and Vitamin Concentrations

Sekizawa

Sawai

Tanaka³

et al. 2012

Journal of Reproduction and Development

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Abstract. The objective of this study was to investigate the relationship between the plasma concentrations of vitamin A (VA), vitamin E (VE) and β-carotene (BC) during embryo collection in Japanese Black cows that had undergone superovulation treatment and the embryo collection results. Following superovulation treatment in 116 Japanese Black cows, we collected 1317 embryos by nonsurgical means seven days after artificial insemination. The collected embryos were classified into transferable embryos, unfertilized oocytes and degenerated embryos. After embryo collection, we collected blood samples from the cows and measured the plasma concentrations of VA, VE and BC. The cows were then divided into 2 groups depending on the plasma concentration of VA (L and H: < 80 IU/dl and ≥ 80 IU/dl), VE (L and H: < 150 μg/dl and ≥ 150 μg/dl) and BC (L and H: < 150 μg/dl and ≥ 150 μg/dl). As a result, the number of collected embryos in the H group of VE was significantly (P<0.01) higher than that in L groups. Furthermore, the number of transferable embryos was higher (P<0.05) in all VA, VE and BC H groups than in the L groups. The H group for BC showed a high ratio of transferable embryos compared with the L group (P<0.05). Consequently, the present study suggests that the plasma VE and BC concentrations are positively correlated with the embryo collection results.

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mentioning

confidence: 99%

Relationship between Embryo Collection Results after Superovulation Treatment of Japanese Black Cows and Their Plasma β-carotene and Vitamin Concentrations

Sekizawa

Sawai

Tanaka³

et al. 2012

Journal of Reproduction and Development

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“…The ratio of FSH to LH in the gonadotrophin preparations [8,10] affect the quality of embryos recovered from superovulated sheep. FSH is a superior gonadotrophin to eCG in sheep and goats [3,14] probably due to the high LH bioactivity of eCG. Both the variability in the ovarian response and the quality of embryo yield are the main limiting factors in small ruminant transfer programs.…”

Section: Differential Stainingmentioning

confidence: 99%

Sheep embryos derived from FSH/eCG treatment have a lower in vitro viability after vitrification than those derived from FSH treatment

et al. 2001

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-In the non breeding period, the effect of two superovulatory treatments (eCG/FSH in single dose or FSH alone in four decreasing doses) on the production of embryo quality following in vitro viability after vitrification procedures was investigated using forty-four adult Sarda breed ewes. In sheep treated with eCG/FSH, the mean number of corpora lutea was significantly (P < 0.05) higher (11.8 ± 4.0 vs. 8.05 ± 3.8), although the recovery rate was significantly (P < 0.01) lower (74.6 vs. 59.9) than with FSH alone. After vitrification (ethylene glycol and glycerol) was repeated three times, the rates of re-expansion at first and second warming were significantly (P < 0.01) higher in embryos derived from FSH alone than in those with both gonadotrophins (94.9 and 41.9 vs. 72.8 and 18.6) and after the last vitrification the hatched blastocyst rates were 22.5 and 7.6. After differential stain, blastocysts derived from FSH alone showed a mean number of cells significantly higher than blastocysts from eCG/FSH (184.2 vs. 157.7). It was concluded that superovulatory treatment with eCG/FSH may increase the ovarian responses compared with FSH alone, but these embryos showed a reduction in viability rates after repeated vitrification. superovulation / embryo quality / ovine / vitrification / viabilityRésumé -Les embryons ovins obtenus après un traitement de superovulation associant FSH et eCG ont une viabilité in vitro plus faible après vitrification que les embryons obtenus avec un traitement séquentiel de FSH. Pendant la saison non reproductive, on a évalué, chez 44 brebis adultes de race Sarde, l'effet de deux traitements de superovulation (le premier avec les eCG/FSH en une seule administration, le deuxième avec la FSH administrée en quatre doses décroissantes) sur la qualité des embryons produits et sur la viabilité in vitro après vitrification. Dans le groupe traité avec les eCG/FSH, le nombre moyen d'ovulations était plus élevé (11,8 ± 4,0 vs. 8,05 ± 3,8, P < 0,05) tandis que le taux de récupération était plus faible (74,6 vs. 59,9, P < 0,01) par rapport au groupe traité avec la FSH seule. Les embryons ont suivi 3 vitrifications successives (éthylène glycol et glycérol). Reprod. Nutr. Dev. 41 (2001) [239][240][241][242][243][244][245][246] 239

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“…The major disadvantage of gonadotrophin treatment is the great variability of ovarian response between and within animals 3,5,12 . For instance, data analysis from 960 cows treated for superovulation during a 10-year period (in the Embryo Transfer Unit of the Instituto de Zootecnia, Nova Odessa, SP, Brazil) showed an average of 6.1 recovered embryos but the standard deviation was 5.1.…”

Section: Introductionmentioning

confidence: 99%

Endocrine profiles and ovulation rate of cows superovulated with FSH following passive immunization against steroid free-bovine follicular fluid

Alvarez¹,

Carvalho²,

Silva³

et al. 1997

Theriogenology

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Recent advances in superovulation of cattle

Cited by 141 publications

References 80 publications

Relationship between Embryo Collection Results after Superovulation Treatment of Japanese Black Cows and Their Plasma β-carotene and Vitamin Concentrations

Relationship between Embryo Collection Results after Superovulation Treatment of Japanese Black Cows and Their Plasma β-carotene and Vitamin Concentrations

Sheep embryos derived from FSH/eCG treatment have a lower in vitro viability after vitrification than those derived from FSH treatment

Endocrine profiles and ovulation rate of cows superovulated with FSH following passive immunization against steroid free-bovine follicular fluid

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