This study evaluated Anti-Mullerian hormone (AMH) and/or follicle counts as predictors of subsequent superovulatory response and embryo production in 79 beef cows. Before superovulation, 3 to 5 mm follicles presented ...This study evaluated Anti-Mullerian hormone (AMH) and/or follicle counts as predictors of subsequent superovulatory response and embryo production in 79 beef cows. Before superovulation, 3 to 5 mm follicles presented on the ovaries of donor cows were counted, and blood was collected for measure of serum AMH. Across cows, serum AMH ranged from 0.013 to 0.898 ng/mL, with a mean of 0.293 ng/mL. The distribution of both AMH concentrations and follicle counts were divided into quartiles (AMH Q1 through Q4, with Q1 the lowest and Q4 the highest) for analysis. Donor cows in AMH Q4 had a greater (P < 0.001) number of 3 to 5 mm follicles at the start of superovulation than did donors in either Q1 or Q2. At embryo collection, cows in AMH Q3 and 4 had more (P < 0.001) palpable corpora lutea (CL) than cows in AMH Q1. The mean number of embryos recovered from donor cows in AMH Q4 was greater (P < 0.001) than those recovered from cows in either AMH Q1 or 2, but similar to that of AMH Q3. Analysis indicated that AMH was positively correlated (P < 0.001) with mean follicles (r = 0.458), CL (r = 0.452) and embryos recovered (r = 0.430). Donor cows with higher follicle counts (F Q3 and 4) at the start of superovulation had more (P < 0.001) palpable CL at embryo collection than donor cows in F Q1 or 2. More (P < 0.001) embryos were recovered from cows with the highest follicle counts (F Q4) as compared with cows having lower (F Q1 and 2) follicle counts. Results confirm that relative AMH concentration was positively correlated with number of small antral follicles in the ovaries of cows;both AMH measure and antral follicle counts might be used to predict subsequent superovulatory response in beef cows.展开更多
Reproductive biotechnologies offer us greater possibilities to improve animal genetics. However, the success of these depends on different factors such as the proper selection of the donor female. For this reason, end...Reproductive biotechnologies offer us greater possibilities to improve animal genetics. However, the success of these depends on different factors such as the proper selection of the donor female. For this reason, endocrine markers have been used to evaluate the ovarian reserve, which allow a successful selection of donors. Recent research has shown, among other things, that concentrations greater than 0.130 ng/mL of anti-Mullerian hormone (also known as Muller-inhibiting substance, which is a member of the transforming growth factor beta superfamily of growth and differentiation factors) are related to donors of more than fifteen transferable embryos. Therefore, this review describes studies showing that the measurement of anti-Müllerian hormone concentrations, before superovulation programs, reduces the costs per embryo produced.展开更多
研究旨在探讨新西兰兔采用不同激素诱导超数排卵和胚胎移植效果的影响因素。试验考察不同激素[促卵泡激素(FSH)、孕马血清促性腺激素(PMSG)]、季节及经产与否等因素对母兔(供体)超数排卵效果的影响,并考察经产与否及同步发情方式对母兔...研究旨在探讨新西兰兔采用不同激素诱导超数排卵和胚胎移植效果的影响因素。试验考察不同激素[促卵泡激素(FSH)、孕马血清促性腺激素(PMSG)]、季节及经产与否等因素对母兔(供体)超数排卵效果的影响,并考察经产与否及同步发情方式对母兔(受体)胚胎移植效果的影响。结果显示,使用两种不同方案进行超排后,试验组Ⅰ母兔的排卵点总数、平均排卵点数、卵泡囊肿总数、平均卵泡囊肿数、可用胚胎总数、平均可用胚胎数、畸形胚胎数、胚胎畸形率均高于试验组Ⅱ(P>0.05),且两组中经产母兔平均排卵点数、平均可用胚胎数均显著高于青年母兔(P<0.05),春季进行超数排卵的平均排卵点数、平均可用胚胎数显著高于夏季(P<0.05)。经产母兔作为受体的妊娠率和产活仔数均高于青年母兔,但差异不显著(P>0.05)。光照调控组的妊娠率和产活仔数最高,但3组差异不显著(P>0.05)。研究表明,春季使用经产母兔为供体,采用60 IU PMSG进行超数排卵处理,通过光照调控同步发情,以经产母兔为受体进行胚胎移植,受孕率和产活仔数最佳。展开更多
文摘This study evaluated Anti-Mullerian hormone (AMH) and/or follicle counts as predictors of subsequent superovulatory response and embryo production in 79 beef cows. Before superovulation, 3 to 5 mm follicles presented on the ovaries of donor cows were counted, and blood was collected for measure of serum AMH. Across cows, serum AMH ranged from 0.013 to 0.898 ng/mL, with a mean of 0.293 ng/mL. The distribution of both AMH concentrations and follicle counts were divided into quartiles (AMH Q1 through Q4, with Q1 the lowest and Q4 the highest) for analysis. Donor cows in AMH Q4 had a greater (P < 0.001) number of 3 to 5 mm follicles at the start of superovulation than did donors in either Q1 or Q2. At embryo collection, cows in AMH Q3 and 4 had more (P < 0.001) palpable corpora lutea (CL) than cows in AMH Q1. The mean number of embryos recovered from donor cows in AMH Q4 was greater (P < 0.001) than those recovered from cows in either AMH Q1 or 2, but similar to that of AMH Q3. Analysis indicated that AMH was positively correlated (P < 0.001) with mean follicles (r = 0.458), CL (r = 0.452) and embryos recovered (r = 0.430). Donor cows with higher follicle counts (F Q3 and 4) at the start of superovulation had more (P < 0.001) palpable CL at embryo collection than donor cows in F Q1 or 2. More (P < 0.001) embryos were recovered from cows with the highest follicle counts (F Q4) as compared with cows having lower (F Q1 and 2) follicle counts. Results confirm that relative AMH concentration was positively correlated with number of small antral follicles in the ovaries of cows;both AMH measure and antral follicle counts might be used to predict subsequent superovulatory response in beef cows.
文摘Reproductive biotechnologies offer us greater possibilities to improve animal genetics. However, the success of these depends on different factors such as the proper selection of the donor female. For this reason, endocrine markers have been used to evaluate the ovarian reserve, which allow a successful selection of donors. Recent research has shown, among other things, that concentrations greater than 0.130 ng/mL of anti-Mullerian hormone (also known as Muller-inhibiting substance, which is a member of the transforming growth factor beta superfamily of growth and differentiation factors) are related to donors of more than fifteen transferable embryos. Therefore, this review describes studies showing that the measurement of anti-Müllerian hormone concentrations, before superovulation programs, reduces the costs per embryo produced.
文摘研究旨在探讨新西兰兔采用不同激素诱导超数排卵和胚胎移植效果的影响因素。试验考察不同激素[促卵泡激素(FSH)、孕马血清促性腺激素(PMSG)]、季节及经产与否等因素对母兔(供体)超数排卵效果的影响,并考察经产与否及同步发情方式对母兔(受体)胚胎移植效果的影响。结果显示,使用两种不同方案进行超排后,试验组Ⅰ母兔的排卵点总数、平均排卵点数、卵泡囊肿总数、平均卵泡囊肿数、可用胚胎总数、平均可用胚胎数、畸形胚胎数、胚胎畸形率均高于试验组Ⅱ(P>0.05),且两组中经产母兔平均排卵点数、平均可用胚胎数均显著高于青年母兔(P<0.05),春季进行超数排卵的平均排卵点数、平均可用胚胎数显著高于夏季(P<0.05)。经产母兔作为受体的妊娠率和产活仔数均高于青年母兔,但差异不显著(P>0.05)。光照调控组的妊娠率和产活仔数最高,但3组差异不显著(P>0.05)。研究表明,春季使用经产母兔为供体,采用60 IU PMSG进行超数排卵处理,通过光照调控同步发情,以经产母兔为受体进行胚胎移植,受孕率和产活仔数最佳。
