共查询到18条相似文献，搜索用时 187 毫秒
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采用不同药物处理和给药方式,对不同品种水牛在不同季节自然发情和同期发情配种后的受胎效果进行系统研究,以期建立一套稳定的适合水牛同期发情的处理方法。试验选取本地水牛(102头)、摩拉水牛(129头)、尼里/拉菲水牛(98头)和杂交水牛(326头)共655头,分为5个组进行比较试验。结果表明:河流型摩拉水牛和尼里/拉菲水牛的同期发情率和配种受胎率均高于杂交水牛和本地水牛(P<0.05),但同为河流型的摩拉和尼里/拉菲水牛之间没有差异(P>0.05),以本地水牛效果最差,其同期发情率和配种受胎率分别为74.51%和30.39%;应用不同的药物处理时,以GnRH+PGF2α+GnRH效果最好,同期发情率和受胎率分别为88.46%和46.38%,其同期发情率显著高于其他各药物组(P<0.05),而用PGc的效果最差(分别为79.10%和33.21%);用PMSG肌注+PGc灌注法,其同期发情率和受胎率效果最好,显著高于其他各组(P<0.05),其次是PMSG肌注+PGc肌注法,PGc肌注法效果最差;在冬季进行同期发情处理时,同期发情率和受胎率最高(分别为83.75%和43.28%),明显高于其他各季节(P<0.05);水牛自然发情的人工授精受胎率和胚胎移植的受胎率均比同期发情的高,差异显著(P<0.05)。 相似文献
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为探讨云南水牛同期发情的效果,于2007～2009年在云南大理、德宏对摩本杂水牛和尼本杂水牛共260头采用CIDR+PG、两次PG法进行了同期发情处理,以期提高云南水牛的同期发情率和冷冻精液人工授精配种受胎率。结果表明:摩本杂和尼本杂水牛经同期发情处理后发情率分别为86.54%和86.81%,冷冻精液配种后受胎率分别为48.89%和49.37%。两者间差异不显著(P0.05)。采用CIDR+PG同期发情处理法的效果无论在同期发情率还是受胎率上都明显好于两次PG法。两者间差异显著(P0.05)。在秋季进行同期发情处理,水牛的同期发情率最高,可达88.71%,明显高于春季的73.17%。在受胎率方面,也是秋季效果要好于春季,两者间差异显著(P0.05)。同期发情和自然发情受胎率方面,同期发情处理的受胎率为45.09%,自然发情受胎率为34.5%,两者间差异极显著(P0.01)。 相似文献
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为了繁育纯种地中海水牛,试验采用"促黄体素释放激素A3+氯前列醇+促黄体素释放激素A3"同期化处理国外引进的地中海育成水牛,并用引进的地中海水牛冻精进行人工授精。结果表明:经同期化处理的地中海水牛发情率为87.07%,淡、旺季发情率差异不显著(P0.05);情期受胎率为37.39%,旺季配种受胎率显著高于淡季;淡季母牛48 h内排卵率为59.72%,旺季为81.13%,差异显著(P0.05)。间隔一定时间重复处理不影响发情率和受胎率。地中海水牛同期发情-人工授精效果与摩拉水牛、尼里-拉菲水牛、本地水牛的处理效果基本一致。 相似文献
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本实验旨在探讨不同药物处理、季节和生产阶段对奶水牛同期发情效果的影响，为进一步优化并提高同期发情效果提供依据。选择2～8岁、体重350～700 kg的本地奶水牛90头(后备牛40头、经产牛50头)。试验一：选取33头后备牛，随机分为2组，采用GnRH+PGF2α+GnRH法(GnRH组)和CIDR+PGF2α法(CIDR组)处理，在秋季观察其同期发情效果；试验二：选取40头后备牛，采用GnRH+PGF2α+GnRH法处理，观察春季、秋季和冬季奶水牛同期发情效果；试验三：选用17头后备牛和50头经产牛，采用GnRH+PGF2α+GnRH法处理，观察不同生产阶段奶水牛同期发情效果。结果表明：GnRH组和CIDR组的发情率、排卵率分别为94.12%、81.25%和81.25%、76.92%；冬季、秋季发情率(100.00%、94.12%)均高于春季(58.33%)(P<0.01)，秋、冬两季差异不显著；排卵率由高到低依次为冬季(90.91%)、秋季(81.25%)、春季(57.14%)(P>0... 相似文献
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于黄牛发情季节应用国产氯前列烯醇 2次处理黄牛具有明显的同期发情效果 ,96小时内母牛同期发情率可达 80 %～ 92 .5% ,母牛于第 2次药物处理发情后发情率、卵泡发育率无明显差异 ,3mg氯前列烯醇剂量的人工配种情期受胎率与自然发情情期配种受胎率相比差异显著 相似文献
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《中国草食动物科学》2015,(4)
为提高奶牛业经济效益,利用模式化配种方案以期找到一种经济、高效和合理的配种方法。随机选择产后45 d以上的空怀奶牛105头,分为4组,分别用4种不同的激素处理方案(PG方案;生源+PG+生源方案;促排3号+PG+促排3号方案;促排3号+PG方案)模式化配种。结果表明:PG处理后,奶牛同期发情率较高,情期受胎率可达45.45%;生源+PG+生源方案和促排3号+PG+促排3号方案处理后,奶牛发情率较低,但排卵率较高,受胎率达到40%左右。说明模式化配种方案可以达到预期的妊娠结果,适宜在奶牛场推广。 相似文献
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为了探讨山区农村黄牛人工授精技术及筛选最适合同期发情处理的催情药物和配伍,采用两组药物进行了同期发情配种试验,一组采用的是生源2+1(GnRH+PGF2a+GnRH)的处理方法;另一组采用的是孕马血清+前列腺素(PMSG+PGs)的处理方法,每组做了3期(三个村),6期共处理了本地母黄牛150头(每组各75头)。试验结果:发情并人工授精143头(一组71头,二组72头)。受胎产仔73头(一组39头,二组34头)。虽然处理一组的牛有发情表现并人工授精的头数比二组的少,但配种后的受胎率和产仔率都比二组的高。建议:山区农村黄牛同期发情配种采用生源2+1的处理方法。 相似文献
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The objective of this study was to determine if factors associated with the biostimulatory effect of bulls alter breeding performance of primiparous, suckled beef cows using a progestin-based estrous synchronization protocol. We tested the hypotheses that the estrous synchronization response and AI pregnancy rates differ among cows exposed to bulls, continuously exposed to bull urine, and exposed to fence-line contact with bulls or cows not exposed to bulls or bull urine. Data were collected from 3 experiments performed over consecutive years. Cows were assigned to the following treatments: bull exposure (BE; n = 26) or no bull exposure (NB; n = 25) in Exp. 1, bull urine exposure (BUE; n = 19) or steer urine exposure (SUE; n = 19) in Exp. 2, and fence-line contact with bulls (BFL; n = 26) or no bull exposure (NB; n = 26) in Exp. 3. Synchronization protocols in each experiment included the use of a controlled internal drug release device (d -10), PGF(2alpha) (d -3), and GnRH and fixed-time AI (TAI; d 0). Cows that were observed in estrus by 60 h after PGF(2alpha) were inseminated 12 h later. Cows not observed in estrus by 60 h after PGF(2alpha) were TAI at 72 h and given GnRH (100 mug). Pregnancy was determined by ultrasonography 35 d after TAI. In Exp. 1, 2, and 3, cows were exposed directly to bulls, bull urine, or bull fence-line contact for 35, 64, and 42 d, respectively. Data were analyzed between treatments within each experiment. The proportion of estrous cycling cows did not differ between treatments at the beginning of each experiment; however, more (P < 0.05) BE and BFL cows were estrous cycling at the beginning of the estrous synchronization protocol than NB cows in Exp. 1 and 3. The proportion of cows that showed estrus and interval to estrus after PGF(2alpha) did not differ between treatments in Exp. 1 and 3. However, in Exp. 2, more BUE cows tended (P = 0.09) to have shorter intervals to estrus and to exhibit estrus after PGF(2alpha) than SUE cows. Overall, AI pregnancy rates were greater (P < 0.05) for BE and BUE cows than for NB and SUE cows in Exp. 1 and 2, respectively. There was no difference in AI pregnancy rates between BFL and NB cows in Exp. 3. The presence of bulls and exposure to bull urine appeared to improve breeding performance of primiparous beef cows using a progestin-based estrous synchronization protocol, whereas fence-line bull exposure was insufficient to cause this biostimulatory effect. We propose that a novel urinary pheromone of bulls may be responsible for the enhancement of fertility in the primiparous, postpartum cow. 相似文献
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Larson JE Lamb GC Stevenson JS Johnson SK Day ML Geary TW Kesler DJ DeJarnette JM Schrick FN DiCostanzo A Arseneau JD 《Journal of animal science》2006,84(2):332-342
We determined whether a fixed-time AI (TAI) protocol could yield pregnancy rates similar to a protocol requiring detection of estrus, or estrous detection plus TAI, and whether adding a controlled internal device release (CIDR) to GnRH-based protocols would enhance fertility. Estrus was synchronized in 2,598 suckled beef cows at 14 locations, and AI was preceded by 1 of 5 treatments: 1) a CIDR for 7 d with 25 mg of PG F(2alpha) (PGF) at CIDR removal, followed by detection of estrus and AI during the 84 h after PGF; cows not detected in estrus by 84 h received 100 mug of GnRH and TAI at 84 h (control; n = 506); 2) GnRH administration, followed in 7 d with PGF, followed in 60 h by a second injection of GnRH and TAI (CO-Synch; n = 548); 3) CO-Synch plus a CIDR during the 7 d between the first injection of GnRH and PGF (CO-Synch + CIDR; n = 539); 4) GnRH administration, followed in 7 d with PGF, followed by detection of estrus and AI during the 84 h after PGF; cows not detected in estrus by 84 h received GnRH and TAI at 84 h (Select Synch & TAI; n = 507); and 5) Select Synch & TAI plus a CIDR during the 7 d between the first injection of GnRH and PGF (Select Synch + CIDR & TAI; n = 498). Blood samples were collected (d -17 and -7, relative to PGF) to determine estrous cycle status. For the control, Select Synch & TAI, and Select Synch + CIDR & TAI treatments, a minimum of twice daily observations for estrus began on d 0 and continued for at least 72 h. Inseminations were performed using the AM/PM rule. Pregnancy was diagnosed by transrectal ultrasonography. Percentage of cows cycling at the initiation of treatments was 66%. Pregnancy rates (proportion of cows pregnant to AI of all cows synchronized during the synchronization period) among locations across treatments ranged from 37% to 67%. Pregnancy rates were greater (P < 0.05) for the Select Synch + CIDR & TAI (58%), CO-Synch + CIDR (54%), Select Synch & TAI (53%), or control (53%) treatments than the CO-Synch (44%) treatment. Among the 3 protocols in which estrus was detected, conception rates (proportion of cows that became pregnant to AI of those exhibiting estrus during the synchronization period) were greater (P < 0.05) for Select Synch & TAI (70%; 217 of 309) and Select Synch + CIDR & TAI (67%; 230 of 345) cows than for control cows (61%; 197 of 325). We conclude that the CO-Synch + CIDR protocol yielded similar pregnancy rates to estrous detection protocols and is a reliable TAI protocol that eliminates detection of estrus when inseminating beef cows. 相似文献
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氯前列烯醇、孕酮阴道栓单独或结合其它激素处理本地母水牛后的发情和受胎情况 总被引：12，自引：2，他引：10
本试验研究对比了PGc、CIDR、PGC +PMSG和CIDR +PGc对 2 95头本地母水牛同期发情定时输精的发情率和受胎率。同时对处理后发情的母水牛分别在第一次输精时肌注hCG、LRHA并以不注射的作对照 ,探讨hCG和LRHA对发情母水牛排卵和受胎的效果。也分析了同一处理方法对处女水牛和经产水牛同期发情率和受胎率的差异。结果表明 :采用CIDR +PGc的同期发情率和受胎率最高 (85 .13%、4 6 .0 3% ) ,PGc +PMSG、CIDR和PGc组的发情率和受胎率分别是 73.0 1%和 4 3.4 8%、78.0 2 %和 4 3.6 6 %、6 4 .18%和 4 1.6 8%。CIDR +PG组的发情率极显著高于PGc组 (P <0 .0 1) ,其它各组间无显著差异 (P >0 .0 5 )。各组母牛的受胎率无显著差异 (P >0 .0 5 )。发情的母水牛在第一次输精时肌注hCG或者LRHA3,排卵率为 89.78%和 91.38% ,极显著高于不处理母水牛 (5 9.74 % ) (P <0 .0 1) ;但受胎率与对照组无显著差异 (P >0 .0 5 )。本试验 4种同期发情处理方法在发情率上经产牛 (84 .4 7% )显著高于处女牛 (5 5 .91% ) (P <0 .0 5 ) ;但受胎率 (45 .6 1% :38.4 6 % )无显著差异 (P >0 .0 5 )。 相似文献
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At the beginning of the breeding season, most beef herds consist of a population of cyclic and anestrous postpartum cows. To be most effective and economical, an estrous synchronization method for postpartum beef cows must be capable of synchronizing estrus in cyclic cows and inducing estrus in anestrous cows. In the first of two experiments, the combination of melengestrol acetate (MGA) fed for 9 d and prostaglandin F2 alpha (PGF2 alpha) administered on the last day of MGA feeding synchronized estrus in cyclic cows (94%) and induced estrus in anestrous cows (66%) as effectively as combining PGF2 alpha with a progestin implant (97 and 75%, respectively). In the second experiment, MGA treatment was necessary for 7 d prior to administering PGF2 alpha to maximize the expression of estrus in cyclic and anestrous cows. In both experiments the proportion of cows exhibiting a synchronized estrus and the pregnancy rates tended to be higher for cows that were cyclic prior to treatment. However, the MGA-PGF2 alpha treatments consistently induced estrus in more than 50% of the anestrous cows and approximately one-third of the cows that were anestrous prior to treatment conceived during the synchronized breeding period. The MGA-PGF2 alpha treatment was 33 to 46% less expensive than a comparable estrous synchronization method that is approved by the U.S. Food and Drug Administration. If feeding MGA and administering PGF2 alpha is approved, it may be the treatment of choice for synchronizing estrus in cyclic cows and inducing estrus in anestrous cows when supplemental feeding is feasible. 相似文献
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旨在研究不同处理方法对巴美肉羊同期发情效果的影响。采用CIDR(孕酮阴道栓)+PMSG(孕马血清促性腺激素)+PGF2α(氯前列烯醇)和CIDR+PMSG2种不同处理方法对内蒙古巴彦淖尔市养殖场中本地绵羊(即巴美肉羊)进行同期发情处理,比较二者的发情率。结果表明,CIDR+PMSG+PGF2α处理组试验羊的发情率为74%,CIDR+PMSG处理组试验羊的发情率为94%。由该试验结果可以得出,采用CIDR+PMSG处理方法对巴美肉羊进行同期发情处理效果更佳。 相似文献
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Fernando LóPEZ-GATIUS Irene LóPEZ-HELGUERA Fabio DE RENSIS Irina GARCIA-ISPIERTO 《The Journal of reproduction and development》2015,61(5):465-471
This study compared the responses shown by lactating dairy cows to four different P4-based protocols for AI at estrus. Cows with no estrous signs 96 h after progesterone intravaginal device (PRID) removal were subjected to fixed-time AI (FTAI), and their data were also included in the study. In Experiment I, follicular/luteal and endometrial dynamics were assessed every 12 h from the beginning of treatment until AI. The estrous response was examined in Experiment II, and fertility was assessed in both experiments. The protocols consisted of a PRID fitted for five days, along with the administration of different combinations of gonadotropin releasing hormone (GnRH), equine chorionic gonadotropin and a single or double dose (24 h apart) of prostaglandin F2α. In Experiment I (40 cows), animals receiving GnRH at the start of treatment showed a significantly higher ovulation rate during the PRID insertion period while estrus was delayed. In Experiment II (351 cows),
according to the odds ratios, cows showing luteal activity at the time of treatment were less likely to show estrus than cows with no signs of luteal activity. Treatment affected the estrous response and the interval from PRID removal to estrus but did not affect conception rates 28–34 days post AI. Primiparous cows displayed a better estrous response than multiparous cows. Our findings reveal acceptable results of 5-day P4-based protocols for AI at estrus in high-producing dairy cows. Time from treatment to estrus emerged as a good guide for FTAI after a 5-day P4-based synchronization protocol. 相似文献
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《The Professional Animal Scientist》2003,19(1):19-22
Two estrous synchronization protocols were used to determine their effect on estrous characteristics, synchronization rates, and pregnancy rates in nulliparous beef heifers on a commercial cow-calf operation in western New Mexico. Fifty-three Red Angus and Angus × Hereford heifers were sorted by age and BW to compare heifers treated with gonadotropin-releasing hormone (GnRH) 7 d before treatment with prostaglandin F2α [PGF2α; SelectSynch (SS); n = 26] and heifers treated with two administrations of PGF2α 14 d apart [Targeted Breeding™ (TB) (Pharmacia, Kalamazoo, MI); n = 27). An androgenized cow fitted with a chin-ball marker was placed in each pen of heifers, and a HeatWatch (HW) transmitter (DDx, Inc., Denver, CO) was attached to each heifer to monitor estrous characteristics. Heifers were artificially inseminated after estrus was determined by HW. Number of standing events tended (P=0.12) to increase for TB heifers compared with SS heifers (54.4 ± 7.4 and 37.5 ± 7.7, respectively). Duration of estrus was increased (P<0.05) in TB heifers (16.0 ± 1.3 h) compared with SS heifers (11.6 ± 1.3 h). However, overall synchronization and pregnancy rates were similar (P>0.10) between protocols. Androgenized cows identified 53% of the estruses detected by HW. When utilizing synchronization protocols, radiotelemetric estrous detection systems may identify more heifers in estrus than androgenized cows. Intensity of estrus was increased in TB heifers compared with SS heifers; however, synchronization and pregnancy rates were not influenced by synchronization protocol. 相似文献
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Application of AI in extensive beef cattle production would be facilitated by protocols that effectively synchronize ovarian follicular development and ovulation to enable fixed-time AI (TAI). The objectives were to determine whether use of a controlled internal drug release (CIDR) device to administer progesterone in a GnRH-based estrous synchronization protocol would optimize blood progesterone concentrations, improve synchronization of follicular development and estrus, and increase pregnancy rates to TAI in beef cows. Beef cows (n = 1,240) in 6 locations within the US Meat Animal Research Center received 1 of 2 treatments: 1)?an injection of GnRH [100 μg intramuscularly (i.m.)] followed by PGF(2α) (PGF; 25 mg i.m.) 7 d later (CO-Synch), or 2) CO-Synch plus a CIDR during the 7 d between GnRH and PGF injections (CO-Synch + CIDR). Cows received TAI and GnRH (100 μg i.m.) at 60 h after PGF. Progesterone was measured by RIA in blood samples collected 2 wk before and at initiation of treatment (d 0) and at PGF injection (d 7). Estrous behavior was monitored by Estrotect Heat Detectors. Pregnancy was diagnosed by ultrasonography 72 to 77 d after TAI. Plasma progesterone concentrations did not differ (P > 0.10) between synchronization protocols at first GnRH injection (d 0), but progesterone was greater (P < 0.01) at PGF injection (d 7) in cows receiving CO-Synch + CIDR vs. CO-Synch as a result of fewer CIDR-treated cows having progesterone ≤1 ng/mL at PGF (10.7 vs. 29.6%, respectively). A greater (P < 0.01) proportion of CO-Synch + CIDR vs. CO-Synch cows were detected in estrus within 60 h after PGF (66.7 vs. 57.8 ± 2.6%, respectively) and a greater (P < 0.01) proportion were pregnant to TAI (54.6 vs. 44.3 ± 2.6%, respectively). For both synchronization protocols, cows expressing estrus within 60 h before TAI had a greater pregnancy rate than cows without estrus. For cows with plasma progesterone ≤1 ng/mL at PGF injection, CO-Synch + CIDR increased pregnancy rate (65.2 ± 5.9 vs. 30.8 ± 3.4% with vs. without CIDR), whereas pregnancy rates did not differ (P > 0.10) between protocols (52.1 ± 2.1 vs. 50.0 ± 2.4%, respectively) when progesterone was >1 ng/mL (treatment × progesterone; P < 0.01). Inclusion of a CIDR in the synchronization protocol increased plasma progesterone concentration, proportion of cows detected in estrus, and pregnancy rate; however, the increase in pregnancy rate from inclusion of the CIDR was primarily in cows with decreasing or low endogenous progesterone secretion during treatment. 相似文献