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人绒毛膜促性腺激素(HCG)对母牛具有促进卵泡发育、排卵作用.利用这一特性,在母牛发情时肌肉注射该激素后输精,能够显著提高受胎率.现将象州县各个牛人工授精品改点近几年来的方法介绍如下,供参考. 相似文献
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几年来,广西象州县的多个牛人工授精品改点的受胎率,黄牛为40%~50%,水牛为30%~40%,在这样的情况下,牛的受胎率有待提高。人绒毛膜促性腺激素在母牛体内具有促进卵泡发育、排卵的作用;利用人绒毛膜促性腺激素的这一特性,在母牛发情时肌肉注射,然后进行输精,观察对母牛的受胎率的影响,是否能够提高牛人工授精工作的效益。结果显示,在牛人工授精工作中使用了人绒毛膜促性腺激素,能够提高受胎率,也提高了工作效益。 相似文献
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几年来,广西象州县的多个牛人工授精品改点的受胎率,黄牛为40%～50%,水牛为30%～40%,在这样的情况下,牛的受胎率有待提高。可利用人绒毛膜促性腺激素对母牛具有促进卵泡发育、排卵的作用这一特性,在母牛发情时进行肌肉注射后输精,观察对母牛受胎率的影响,分析母牛人工授精工作的效益。结果显示,在牛人工授精工作中使用了人绒毛膜促性腺激素,能够提高受胎率和工作效益。 相似文献
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目前虽然治疗卵泡囊肿的方法很多,但其治疗效果唯有激素治疗方法为最佳。兹将其治疗方法和结果报道如下。一、材料与方法1.药品:绒毛膜促性腺激素(HCG)和促排卵素2号(促排2号)都是由宁波市激素制品厂生产,批号分别为861027和861118。2.供试牛的选择和分组:选择长期发情、屡配不孕患卵泡囊肿的黑白花奶牛16例,并将这些病例随机分成A(6例)、B(5例)和C(5例)组。3.试验方法:A组静脉注射一次HCG5000单位(两侧均有较重的卵泡囊肿2例第二日再注);B组每日肌注一次促排2号500微克,连续肌注4;次C组每日对有囊肿侧的阴唇粘膜下注射500微克,连续肌注2次。4.疗效判定标准:发情周期恢复正常并排卵,两次发情输精受胎者为治愈;发情周期恢复正常,两次发情输精未受胎者为有效;治疗后仍持续发情者为无效。二、结果A组患畜治疗效果最佳。6例患畜全 相似文献
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本试验应用不同投药途径的绒毛膜促性腺激素（ＨＣＧ）、促黄体素（ＬＨ）和促排３号（ＬＲＨ─Ａ３）等激素对１５０例患有卵泡囊肿的奶牛进行了疗效试验,取得了较好的结果。静注ＨＣＧ５０００单位（试验１组）的治愈率为９４％（４９／５２）,比肌注ＨＣＧ５０００～１００００单位（试验２组）的治愈率５０％（１５／３０）高４４％（ｐ＜０．０１）;静注ＬＨ２００单位（试验３组）的治愈率为９０％（１８／２０）,比肌注ＬＨ２００单位（试验４组）的治愈率５０％（１０／２０）高４０％（ｐ＜０．０１）;卵泡囊肿侧的阴唇粘膜注射ＬＲＨ─Ａ３１０００μｇ（试验６组）,其治愈率为８５．７１％（１２／１４）,这种方法不仅比每日肌注一次ＬＲＨ─Ａ３１０００μｇ,连续注射２次（试验５组）的治愈率６４．２９％（９／１４）高２１．４２％,而且注射次数和用药量均为肌注法的１／２。 相似文献
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对60头繁殖母驴开展了母驴情期人绒毛膜促性腺激素（HCG）处理试验,研究HCG对母驴受胎率的影响。对母驴群体分组,试验组人工输精后,马上肌肉注射不同剂量HCG,在输精18、35 d对试验组母驴进行孕检,并记录受胎的头数,计算受胎率。试验结果显示：试验组母驴情期受胎率高于对照组未经HCG处理的母驴,而且随着经HCG处理的母驴使用剂量增加,试验母驴情期受胎率有所提高。本次试验通过数据比较得出,1 000 IU/头HCG试验组的受胎率达到40%,较未接受HCG处理的对照组母驴情期受胎率提高10%,提高了母驴繁殖率,为科技推广提供了数据支撑。 相似文献
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The objective of this study was to determine whether fluid drainage from the subordinate follicles by ovum pickup procedures prevents the risk of twin pregnancy without reducing the fertility of the cow. Lactating dairy cows with at least two follicles over 12 mm diameter located one on each ovary and selected from synchronized groups for fixed‐time insemination were assigned to a Control (n = 49) or Drainage (n = 49) group. The largest follicle was considered as the dominant follicle. Draining of all subordinate follicles (≥10 mm) was performed in the Drainage group. All drained follicles developed as a corpus luteum 7 days later. In the Control cows, the presence of two corpora lutea (55.1%) was lower (p = .003) than those in the Drainage cows (87.8%), whereas the incidence of twin pregnancies was 50% and 0% for the Control and Drainage groups, respectively (p < .001). Draining did not affect the pregnancy rate. These results indicate that puncture and drainage of the subordinate follicles at insemination may eliminate the risk of twin pregnancies and reduce the risk of subsequent pregnancy loss by increasing the incidence of additional corpora lutea. 相似文献
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A. R. Felisbino Neto;D. F. C. Souza;R. A. Campos;S. Albertini;M. R. Bastos;B. G. Freitas;M. H. A. Colli;F. M. Elliff;J. N. S. Sales;P. S. Baruselli; 《Reproduction in domestic animals》2024,59(3):e14553
This study evaluated the efficacy of the administration of different doses of equine chorionic gonadotropin (eCG; 0 IU, 200 IU, or 300 IU) at the time of the progesterone device removal in 2-year-old Nelore (Bos indicus) heifers synchronized for fixed-timed artificial insemination (FTAI). On day 0 (D0), a total of 398 heifers received 2 mg of oestradiol benzoate i.m., 0.53 mg of cloprostenol i.m., and an eight-day previously used (second use) intravaginal device containing 1 g of progesterone (P4). Eight days later (D8), simultaneous with the P4 device removal, 0.5 mg of oestradiol cypionate i.m. and 0.53 mg of cloprostenol i.m. were administered. At the same time, heifers were randomly assigned to receive one of the following treatments: G-0 IU (n = 141; no eCG treatment), G-200 IU (n = 132; treated with 200 IU of eCG), and G-300 IU (n = 125; treated with 300 IU of eCG). FTAI was performed 48 h after the P4 device removal (D10). Ultrasonographic evaluations were performed at D0, D10, and D17. Heifers were scanned to measure the size of the largest follicle (LF), the presence, number, and size of the corpus luteum (CL), and the ovulation rate. Subsequently, at D40, the heifers underwent scanning to determine the pregnancy rate and identify any twin pregnancies. Additionally, at D70, scans were performed to assess pregnancy loss (PG). Data were analysed by orthogonal contrasts [C1 (eCG effect): control x (200 IU + 300 IU) and C2 (eCG dose effect): 200 IU × 300 IU]. On D0, CL presence was similar between the groups [G-0 IU = 65.2% (92/141), G-200 IU = 55.3% (73/132), and G-300 IU = 63.2% (79/125); p = .16]. No interactions between the presence of CL on D0 and eCG treatment were found for any of the variables (p > .05). The diameter of the LF at FTAI (D10) was not influenced by eCG treatment (p = .22) or eCG dose (p = .18). However, treatment with eCG increased the diameter of the CL at D17 (G-0 IU = 15.7 ± 0.3 mmb, G-200 IU = 16.6 ± 0.2 mma, and G-300 IU = 16.6 ± 0.3 mma; p = .001), regardless of the dose used (p = .94). The ovulation rate was higher in heifers treated with eCG [G-0 IU = 79.4%b (112/141), G-200 IU = 90.2%a (119/132), and G-300 IU = 93.6%a (117/125); p = .002], but there was no effect of eCG dose (p = .36). Pregnancy per AI (P/AI) on D40 [G-0 IU = 32.6%b (46/141), G-200 IU = 42.4%a (56/132), and G-300 IU = 42.4%a (53/125); P = 0.05] and D70 [G-0 IU = 29.1%b (41/141), G-200 IU = 40.9%a (54/132), and G-300 IU = 40.8%a (51/125); p = .02] were higher on heifers that received eCG; however, no dose effect was observed for P/AI on D40 (p = .89) nor D70 (p = .98). Pregnancy loss between D40 and D70 tended to reduce (p = .07) in eCG-treated heifers without dose effect (p = .91). Heifers with CL at D0 presented a greater follicle diameter (LF) on D10 (With CL = 11.2 ± 0.2 mm and Without CL = 10.2 ± 0.2 mm; p = .05), CL diameter on D17 (With CL = 15.8 ± 0.03 mm and Without CL = 11.8 ± 0.6 mm; p = .01), and ovulation rate [With CL = 95.5% (233/244) and Without CL = 74.7% (115/154); p = .01]. However, no difference in pregnancy rate at D40 (p = .52) and D70 (p = .84) was found. In conclusion, eCG treatment increases ovulation and pregnancy rates of heifers submitted to a FTAI protocol. Furthermore, eCG treatment increases the diameter of the CL after FTAI and reduces pregnancy losses. No dose effect was observed, suggesting Nelore (Bos indicus) heifers respond to 200 IU of eCG treatment for FTAI. 相似文献
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Bruno Moura Monteiro Diego Cavalcante de Souza Guilherme Souza Floriano Machado Vasconcellos Thalita Bueno Corrêa Domenico Vecchio Manoel Francisco de Sá Filho Nelcio Antonio Tonizza de Carvalho Pietro Sampaio Baruselli 《Animal Science Journal》2016,87(1):13-20
This study evaluated the effect of new or used P4 devices on the ovarian responses of dairy buffalo that were administered an estradiol (E2) plus progesterone (P4)‐based timed artificial insemination (TAI) protocol during the breeding season. On the first day of the TAI protocol, 142 cows were randomly assigned to receive one of the following: a new device (New; 1.0 g of P4; n = 48); a device that had previously been used for 9 days (Used1x, n = 47); or a device that had previously been used for 18 days (Used2x, n = 47). Ultrasound was used to evaluate the following: the presence of a corpus luteum (CL); the diameter of the dominant follicle (ØDF) during protocol; ovulatory response; and pregnancies per AI (P/AI). Despite similar responses among the treatments, there was a significant positive association of the ØDF during TAI protocol with ovulatory responses and number of pregnancies. In conclusion, satisfactory ovarian responses and a satisfactory pregnancy rate were achieved when grazing dairy buffalo were subjected to the TAI protocol in breeding season, independent of whether a new or used P4 device was used. Furthermore, the presence of the larger follicle was associated with a higher ovulation rate and higher P/AI following TAI. 相似文献
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Persistent endometrial cups are relatively rare in the mare and the occurrence in 2 successive pregnancies, as described in this issue, is an intriguing finding. This article describes an additional 2 cases of endometrial cups persisting in excess of 12 months in mares that had experienced pregnancy loss. Both mares demonstrated irregular ovarian activity in the form of repeated formation of haemorrhagic anovulatory follicles. A definitive diagnosis was made by visualisation of cup tissue by hysteroscopy and demonstration of equine chorionic gonadotropin (eCG) in the mares' serum. Biopsy of endometrial cups was made under visual direction and the mares were treated by chemical curettage with kerosene. The clinical presentation, treatment and possible causes of persistent endometrial cups are reviewed and discussed. 相似文献
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绒毛膜是人工夸成的一种生殖激素。经我们试验时治疗母牛排卵障碍有较好的效果。本试验宗旨是：应用绒毛膜激素治疗母牛排卵障碍,提高受胎率、缩短空怀无数并确定其疗效。 相似文献
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Danilo Amadori Martins de Oliveira Luiz Ernandes Kozicki Francisco Romano Gaievski Victor Breno Pedrosa Romildo Romualdo Weiss Mrcio Saporski Segui Tcia Gomes Bergstein‐Galan 《Reproduction in domestic animals》2019,54(5):779-785
The study aimed to evaluate pregnancy per artificial insemination (P/AI) of cows subjected to synchronization and resynchronization in ovulation protocols using intravaginal progesterone‐releasing insert (P4) before pregnancy diagnosis (PD) and the relationship of PR with the diameter of preovulatory follicles (ØPOF) before TAI. Cows (n = 378) were distributed into two groups: a resynchronization group with new devices (GRN; n = 185) and resynchronization group with used devices (GRU; n = 193). On Day 0, both groups received a new P4 and estradiol benzoate (EB). On D8, P4 removal + D‐cloprostenol + eCG + estradiol cypionate (EC) was done. On d10, TAI was conducted. On d32, cows were resynchronized and divided into two groups, GRN (n = 185) and GRU (n = 193). The GRN group received a new P4 + EB, and the GRU group received a used P4 + EB. On d40, the P4 was removed + PD. The non‐pregnant cows received D‐cloprostenol + eCG + EC. US was done again on d42 to determine ØPOF before the second TAI. The P/AI of the GRN and GRU groups after synchronization were 56.2% and 57.0% (p = 0.87), respectively, and those after resynchronization were 58.0% and 37.3% (p < 0.008), respectively. The P/AI of the GRN and GRU groups observed after TAI (synchronization + resynchronization) were 81.6% and 73.1%, respectively (p = 0.047). No difference (p = 0.067) in ØPOF between the pregnant and non‐pregnant cows in the GRN was found, whereas the GRU group showed a significant difference (p = 0.003). Resynchronization protocols optimized the P/AI in both groups. New intravaginal devices resulted in greater P/AI and P/AI accumulation in resynchronization as compared with the GRU; the ØPOF was related with P/AI. 相似文献
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Pachara Pearodwong Chanyuth Tretipskul Raphee Panyathong Padet Tummaruk 《Reproduction in domestic animals》2020,55(12):1756-1763
Follicle development and timing of ovulation are indicators of the reproductive performance of sows. The present study aimed to determine factors influencing pre-ovulatory follicle diameter and weaning-to-ovulation interval (WOI) in spontaneously ovulating sows in tropical climates with special emphasis on breed, parity and backfat thickness at weaning. In total, 80 sows were included in the study. Follicle development was determined by using transrectal real-time B-mode ultrasonography every 6 hr after standing oestrus. Weaning-to-oestrous interval (WEI), oestrous-to-ovulation interval (EOI), WOI and the diameter of graafian follicles were investigated in relation to breed, parity number (1, 2–3 and 4–7) and backfat thickness (low, moderate and high) of sows. Overall, WEI, EOI, WOI and the pre-ovulatory follicle diameter were 92.5 ± 21.6 hr, 64.3 ± 19.3 hr, 156.3 ± 29.1 hr and 10.3 ± 2.0 mm, respectively. Pre-ovulatory follicle size was smaller in primiparous sows compared with sows of greater parity, 4–7 (9.7 ± 0.51 and 11.7 ± 0.52 mm, respectively, p < .05). Weaning-to-ovulation interval was positively correlated with WEI (r = 0.75, p < .001) and EOI (r = 0.66, p < .001), but negatively correlated with size of the graafian follicle (r = –0.34, p < .01). Sows with a shorter WEI had a larger pre-ovulatory follicle diameter (at 64 hr after oestrus) (r = –0.37, p < .01). Sows with low backfat thickness had a WOI 23.4 hr longer than those with moderate backfat thickness (p < .05) and 17.6 hr longer than sows with a high backfat thickness (p = .140). The follicle diameter in primiparous sows with high backfat thickness (11.7 ± 1.1 mm) was higher than in those with low (8.9 ± 0.7 mm, p < .05) or moderate (8.6 ± 0.8, p < .05) backfat thickness. In conclusion, factors influencing follicle diameter and WOI in sows included parity number and backfat thickness at weaning. The impact of backfat thickness on follicle diameter, WEI and WOI was most pronounced in primiparous sows. 相似文献