共查询到20条相似文献，搜索用时 562 毫秒
1.
为研究烯丙孕素对乏情后备母猪繁殖成绩的影响,将566头225日龄前未发情的长大二元杂种后备母猪分为2组,试验组饲喂烯丙孕素口服液5 m L,连喂18 d;对照组按猪场精液诱情、舍外运动场运动、限饲等流程处理。结果表明,与对照组相比,试验组后备母猪9月龄利用率提高33个百分点(P0.01),配种分娩率提高11.41个百分点(P0.01),胎均活仔数提高0.77头(P0.01),胎均健仔数提高0.97头(P0.01)。说明烯丙孕素能够显著提高225日龄未发情后备母猪的繁殖成绩。 相似文献
2.
烯丙孕素内服溶液调控母猪同期发情的临床药效试验 总被引：2，自引：0，他引：2
为评价国产烯丙孕素内服溶液调控母猪同期发情的临床药效,选取性成熟后备母猪171头进行实验性临床试验和扩大临床试验,根据母猪发情及妊娠情况评价其临床药效。结果显示:实验性临床试验中,国产烯丙孕素内服溶液高(25 mg/d)、中(20 mg/d)、低(10 mg/d)剂量组以及空白对照组母猪从停药到发情的间隔时间分别为(3.45±0.81)d、(3.35±0.66)d、(5.21±2.65)d和(11.71±5.39)d,各用药组的发情间隔与空白对照组相比显著缩短(P0.05);扩大临床试验中,国产烯丙孕素内服溶液组和进口药物对照组的母猪在药物调控下均表现出良好的同期发情效果,发情间隔分别为(3.59±1.07)d和(3.75±1.22)d,发情率分别为96.72%(59/61)和98.33%(59/60)。研究结果表明,国产烯丙孕素内服溶液按推荐剂量(20 mg/d)连续给药18 d,可以使母猪达到良好的同期发情效果。 相似文献
3.
本研究综合应用烯丙孕素、孕马血清促性腺激素等对某商品猪场8~9月龄的400头长大二元杂后备母猪进行同期发情试验,以进一步研究外源激素产品对后备母猪同期发情和繁殖性能等方面的影响。结果表明烯丙孕素+低剂量的孕马血清促性腺激素组合配种利用率最佳。 相似文献
4.
本研究通过田间试验评价进口烯丙孕素内服溶液对性成熟后备母猪同期发情的诱导效果和其对母猪产仔的影响。先后筛选210日龄以上的120头健康后备母猪,随机分为药物受试组和空白对照组,每组60头。药物受试组和空白对照组分别按20 mg/（头·d）口服5 mL进口烯丙孕素内服溶液和饮用水,连续给药18 d。试验中记录各组动物发情时间、妊娠时长、分娩结果（窝产总仔数、窝产活仔数、窝产健仔数）等,计算各组母猪的发情率、同期发情率、妊娠率、分娩率等指标,采用SPSS21.0进行显著性差异分析。结果显示：药物受试组和空白对照组的母猪发情率分别为95.00%和81.67%(P<0.05),其中药物受试组猪在给药结束后第3天开始出现发情,24 h同期发情率为35.00%,48 h同期发情率为68.33%,而空白对照组试验猪发情时间离散,无集中发情规律;2组母猪平均妊娠时长、断奶后平均发情时长、平均窝总仔、窝产活仔和窝产健仔数、仔猪断奶后平均窝重无显著差异。由此可见,烯丙孕素内服溶液可有效诱导母猪同期发情,且对母猪生产无不良影响。 相似文献
5.
试验将72头杂交后备母猪分为2组,每组36头,用烯丙孕素拌料法对杂交后备母猪进行同期发情处理。第1组混和饲喂,分为3大栏,每栏12头;第2组限位栏单栏饲喂,每栏1头。每天每头给药1次,5 mL/次。连续给药18 d后停药,检查后备母猪的发情表现。结果:单栏饲喂与大栏混合饲喂相比,后备母猪总发情率提高13.9个百分点(P<0.05),受胎率提高7个百分点,产仔窝数提高23.1%(P<0.05)。 相似文献
6.
7.
张贤群 《国外畜牧学(猪与禽)》2008,28(1):41-44
为研究烯丙孕素、马绒毛膜促性腺激素(eCG)和人绒毛膜促性腺激素(hCG)或促性腺激素释放激素类似物(GnRH-A)D-Phe6-LHRH在促使诊断为未孕的高胎龄母猪同步发情同步排卵以使其重返预定的人工授精方案中的作用,特进行了一项现场研究。试验选用531头在人工授精后第21～35天期间经超声波检查确诊为未孕的母猪,并随机分入3个试验组:⑴试验Ⅰ组(EGⅠ):每头母猪按16mg/d的剂量连续15d口服烯丙孕素以阻止滤泡的生长,停服24h后肌肉注射1000IU马绒毛膜促性腺激素以刺激卵泡生长,78～80h后再肌肉注射500IU人绒毛膜促性腺激素以诱导排卵;⑵试验Ⅱ组(EGⅡ):除将烯丙孕素的剂量由16mg改为20mg和马绒毛膜促性腺激素剂量由1000IU改为800IU以外,其它与试验Ⅰ组相似;⑶试验Ⅲ组(EGⅢ):除用50μg促性腺激素释放激素类似物D-Phe6-LHRH替代500IU人绒毛膜促性腺激素来诱导排卵外,其它均与试验Ⅱ组相似。试验母猪分别在注射eCG/D-Phe6-LHRH后16h和40h各进行一次人工授精,并利用超声波扫描仪检查卵巢情况以确诊激素处理是否获得成功。记录母猪的受孕率、分娩率、总产仔数和活产仔数,并与同步发情首次配种的母猪比较。试验母猪在激素处理前卵巢结构各不相同,烯丙孕素的两种口服剂量都能使80%以上的母猪卵巢卵泡生长得到阻止,不过口服16mg/d的烯丙孕素会提高多囊卵巢变性的发生率。4%～18%的母猪经烯丙孕素处理后其卵巢中仍存在黄体,大多数母猪在2次人工授精之间或第2次人工授精之后排卵(P<0.05)。注射促性腺激素释放激素类似物(GnRH-A)D-Phe6-LHRH的母猪排卵往往早于注射人绒毛膜促性腺激素的母猪。被诊断为未怀孕的母猪受孕率和分娩率比初次交配母猪低25%(P<0.05)。在诊断为未孕的母猪中,注射促性腺激素释放激素类似物(GnRH-A)D-Phe6-LHRH的母猪受孕率较高(P<0.05),但在总产仔数和活产仔数上各试验组间无显著差异。总之,给诊断为未孕的母猪口服20mg烯丙孕素,然后肌注800IU马绒毛膜促性腺激素和50μg促性腺激素释放激素类似物D-Phe6-LHRH是诱使其同步发情和同步排卵的最佳方法,至于母猪口服烯丙孕素的时间是否一个较长的18d间隔还有待进一步的研究。 相似文献
8.
《饲料工业》2017,(16):49-52
为了研究同期发情+定时输精对母猪发情率、妊娠率及产仔数的影响。试验1:将200头后备母猪随机分成两组,每组100头。所有后备母猪连续饲喂四烯雌酮(ATL)(15 mg/d)14 d,第15 d开始查情。试验组后备母猪停止饲喂ATL 24 h后肌注促性素(PMSG)、再过72 h肌注生源(Gn RH),肌注Gn RH 24 h后开始输精1次,过24 h再输精1次;对照组后备母猪停止饲喂四烯雌酮后有发情就开始输精,过24 h再输精1次(如还发情,第2次输精过24 h后再输精1次);试验2:将200头断奶母猪随机分成两组,每组100头,断奶第2 d开始查情。试验组断奶母猪断奶24 h后肌注促性素(PMSG),再过72 h肌注生源(Gn RH),肌注Gn RH 24 h进行输精1次,过24 h再输精1次;对照组断奶母猪发情就开始输精,过24 h再输精1次(如还发情,第2次输精过24 h后再输精1次);精液剂量为80 ml(2×109个精子细胞)。试验1结果显示,试验组的后备母猪的静立率(P>0.05)、妊娠率(P<0.05)、分娩率(P<0.05)、窝产仔数(P>0.05)均高于对照组。试验2结果显示,试验组的断奶母猪的发情率、妊娠率、分娩率均高于对照组(P>0.05),窝产仔数也高于对照组。试验结果表明,母猪肌注PMSG和Gn RH,可改善母猪的发情率、分娩率、窝产仔数,减少隐性发情母猪的漏配率。 相似文献
9.
后备母猪批次化繁殖的技术探索 总被引：1，自引：0，他引：1
对规模养猪场后备母猪批次化繁殖技术进行了探索。采用连续喷灌烯丙孕素18d,停喂48h后肌肉注射马绒毛膜促性腺激素,78h后肌注GnRH 100μg,之后的24h和46~48h分别进行2次人工授精。同期发情率达到82.1%,主要集中于烯丙孕素停药后的4~5d,情期受胎率达83.3%。 相似文献
10.
为探讨有无初情期和不同定时输精程序处理对后备母猪发情及妊娠的影响,随机选择182头有初情期和193头无初情期的后备母猪,其中将182头有初情期后备母猪分为3组,对照组(C1组,62头)、烯丙孕素组(A1组,60头)、烯丙孕素+孕马血清促性腺激素(PMSG)+促性腺激素释放激素(GnRH)组(APG1组,60头);193头无初情期后备母猪分为对照组(C2组,63头)、烯丙孕素组(A2组,65头)、烯丙孕素+PMSG+GnRH组(APG2组,65头),并且比较不同组间后备母猪的发情集中度、发情率、妊娠率等。结果显示:无初情期A2、APG2组经程序处理后分别于停药后第5～9天、第6天集中发情,有初情期A1组、APG1组母猪于停药后第6～9天、5～6天集中发情;烯丙孕素可显著提高有初情期后备母猪A1组发情率与妊娠率(P0.05),APG1与APG2组的发情率与妊娠率极显著高于C1组、C2组(P0.01),且APG1、APG2组间差异极显著(P0.01);隐性发情后备母猪妊娠率APG1、APG2组间无显著差异(P0.05)。结果表明:有无初情期显著影响后备母猪定时输精处理的效果,利用定时输精程序处理后可使母猪发情集中度、发情率、妊娠率均显著提高。 相似文献
11.
Groups of six, six and eight miniature gilts, respectively, received 5, 10 or 15 mg/day of altrenogest for 18 days, and the numbers of corpora lutea and residual follicles were counted approximately 14 days after the treatment by an exploratory laparotomy. They were compared with the numbers in a control group of eight gilts which were examined six to eight days after oestrus. The interval between the last dose of altrenogest and the onset of oestrus increased with the dose of altrenogest, and was significantly longer after the treatments with 10 or 15 mg/day than after 5 mg/day (P < 0.01). Significantly more corpora lutea were observed in the gilts receiving 5 or 10 mg/day of altrenogest than in the control gilts (P < 0.1). Groups of six, seven and six miniature gilts that had respectively received 5, 10 or 15 mg/day of altrenogest were artificially inseminated; four, six and five of the gilts in these groups farrowed, and their mean (sd) litter sizes were 5.5 (2.4), 6.8 (1.2) and 5.0 (2.3), respectively. All six of a group of control gilts farrowed and their mean litter size was 5.8 (1.2). 相似文献
12.
K Kaeoket 《Reproduction in domestic animals》2008,43(1):127-129
The aim of this study was to further investigate the effect of using progestin altrenogest and hCG to synchronize the oestrous cycle and its effect on follicular development, ovulation time and subsequent reproductive performance. Thirty crossbred gilts were divided into three groups. Group A (control) received a 5 ml of normal saline for 18 consecutive days by individually top-dressing. Groups B and C gilts received 20 mg (5 ml) of progestin altrenogest for 18 consecutive days by individually top-dressing. On day 3 (72 h) after withdrawal of progestin altrenogest, Group C gilts received hCG (500 IU, im). The follicular development and ovulation time were examined by transabdominal ultrasonography. Subsequent reproductive performances, i.e. number of total born per litter (NTB), number of live born per litter (NBA), number of stillbirth per litter (NSB), average piglet birth weight (ABW), lactation length (LL) and weaning to oestrous interval (WOI), were recorded. None of the gilts in Group A showed oestrus within 10 days after withdrawal of normal saline. Groups B (eight of 10) and C gilts (four of 10) came into oestrus at 5.6 +/- 0.5 and 6.5 +/- 0.6 days after withdrawal of progestin altrenogest, respectively. The ovulation time of Groups B and C gilts took placed at 25.0 +/- 4.7 and 25.0 +/- 5.0 h after standing oestrus, respectively. The pre-ovulatory follicular size (diameter) of Groups B and C gilts was 8.0 +/- 2.0 and 11.0 +/- 3.0 mm, respectively. A tendency of larger litter size (NTB) in Group B gilts was found when compared with Group A gilts. To conclude, using progestin altrenogest alone can be used to synchronize the oestrous cycle in gilts without unenthusiastic effect on the follicular development, ovulation time and subsequent reproductive performances. However, treatment of gilts with hCG at day 3 (72 h) after withdrawal of altrenogest had unenthusiastic effect on oestrus synchronization. 相似文献
13.
Fertility of 104 gilts artificially inseminated (AI) at a predetermined time (scheduled AI) after estrous synchronization with altrenogest (15 mg X gilt-1 X d-1 for 18 d) was compared with that of 103 gilts checked for estrus (estrus checked) and inseminated after altrenogest. Scheduled-AI gilts were inseminated once on d 5, 6 and 7 after the last altrenogest feeding (d 0). Estrus-checked gilts were exposed to a boar twice daily at 0830 and 1630 h and inseminated after the second and third estrous detection period following first detected estrus. Percentage of gilts assigned to treatment that farrowed (72.8 vs 67.3%), total pigs farrowed (11 +/- .4 vs 11.3 +/- .4) and pigs born alive (10.1 +/- .4 vs 10.5 +/- .4) were similar for estrus-checked and scheduled-AI gilts, respectively. We conclude that scheduled AI can be used with estrous synchronization for gilts and may have advantages in breeding herd management and the use of AI in swine. 相似文献
14.
In 664 primiparous gilts inseminated twice after oestrus synchronization, the timing of insemination had an important effect on conception rate and litter size. Best results (586 liver piglets per 100 pregnancies) were achieved by a first insemination on the afternoon of the 6th day. Another trial, with sexually mature gilts which were subsequently slaughtered, invloved artificial insemination at a planned time after synchronization of oestus with TRUISYNCHRON plus injection of Prolosan. Pregnancy rate and embryo count on the 29th day after synchronization were good when the first insemination was made on the evening of the 5th day and the second on the evening of the 6th day. Insemination on the morning and evening of the 6th day gave better results than on the evening of the 5th and morning of the 6th day. 相似文献
15.
Estrous and litter traits in gilts altered by altrenogest, flushing and pubertal status 总被引：1，自引：0，他引：1
Influences of estrous synchronization with altrenogest and flushing on reproductive traits in gilts were evaluated in three experiments on two farms. Crossbred gilts were fed altrenogest or altrenogest and an additional 1.55 kg ground sorghum grain for at least 10 d before breeding (flushing), or served as controls. Additional grain for the flushing treatment was provided to gilts from the eighth day of altrenogest treatment until they were detected in estrus. The combination of altrenogest and flushing (on Farm A) increased (P less than .05) litter size when compared with gilts treated only with altrenogest and controls that received neither altrenogest nor flushing. This response was entirely among gilts inseminated at their pubertal estrus. For pubertal gilts fed altrenogest and the flushing treatment, litter traits were similar to other treated or control gilts inseminated at a postpubertal estrus. No treatment effects on litter size were detected for gilts inseminated at a postpubertal estrus. Gilts on Farm B responded differently, with larger litter sizes (P = .08) for those treated with altrenogest and flushing plus altrenogest than for control gilts. Reasons for farm differences might be unidentified genetic or management factors or different seasons of the year when gilts were treated on Farm B (summer) vs Farm A (fall, winter and spring). Our results indicate a marked potential for increasing litter size in gilts mated at their pubertal estrus because their unstimulated ovulation rate (no altrenogest or flushing) did not challenge adequately the biological capacity of their uteri. 相似文献
16.
Gilts (n = 267) were allotted to flushing (1.55 kg/d additional grain sorghum), altrenogest (15 mg.gilt-1.d-1) and control treatments in a 2 x 2 factorial arrangement. Altrenogest was fed for 14 d. Flushing began on d 9 of the altrenogest treatment and continued until first observed estrus; 209 gilts (78%) were detected in estrus. The interval from the last day of altrenogest feeding to estrus was shorter (P less than .05) with the altrenogest + flushing treatment (6.6 +/- .2 d) than with flushing alone (7.6 + .3 d). Ovulation rates (no. of corpora lutea) were higher (P less than .05) in all flushed gilts (14.5 +/- .4 vs 13.4 +/- .4), whether or not they received altrenogest. Flushing also increased the total number of pigs farrowed (.9 pigs/litter; P = .06) and total litter weight (1.43 kg/litter; P = .01), independent of altrenogest treatment. Number of pigs born alive and weight of live pigs were higher for gilts treated with altrenogest + flushing and inseminated at their pubertal estrus than for gilts in all other treatment combinations. In contrast, gilts receiving only altrenogest had greater live litter weight and more live pigs born when inseminated at a postpubertal estrus than when inseminated at pubertal estrus. We conclude that flushing increased litter size and litter weight, particularly for gilts that were inseminated at their pubertal estrus. Increased litter size resulted from increased ovulation rates, which, in nonflushed gilts, limited litter size at first farrowing. 相似文献
17.
NM Soede EG Bouwman P Langendijk I van der Laan A Kanora B Kemp 《Reproduction in domestic animals》2007,42(3):329-332
Synchronization of the oestrous cycle of gilts using altrenogest treatment has been found to increase ovulation rate. The current experiment investigated if the increase in ovulation rate after altrenogest treatment is related to increased follicle size at the end of altrenogest treatment compared with late luteal phase follicles. Crossbred gilts (n = 15) received altrenogest during 18 days [20 mg Regumate (Janssen Animal Health, Beerse, Belgium)], starting 5-7 days after onset of first oestrus. Control gilts (n = 15) did not receive altrenogest. At days 10-12 of the oestrous cycle [i.e. in the presence of corpora lutea (CL)], average follicle development was 2.51 +/- 0.20 mm (assessed with ultrasound) in altrenogest-treated gilts and 2.58 +/- 0.16 mm in control gilts (p > 0.10). During the last days of altrenogest treatment (i.e. when CL had gone into regression), average follicle size had increased to 3.01 +/- 0.31 mm (p < 0.05). Subsequent ovulation rate was 16.6 +/- 1.7 in altrenogest treated gilts and 15.1 +/- 1.2 in control gilts (p < 0.05). Altrenogest treatment resulted in increased follicle size after regression of the CL, showing that suppression of follicle growth by altrenogest alone is less severe than suppression by endogenous progesterone (either with or without altrenogest). Altrenogest treatment also resulted in a higher ovulation rate. However, it is unclear if the increased follicle size and higher ovulation rate after altrenogest treatment are causally related, as the relation between the two on an animal level was not significant. 相似文献
18.
Hodgson D Howe S Jeffcott L Reid S Mellor D Higgins A 《Veterinary journal (London, England : 1997)》2005,169(1):113-115
Oral administration of altrenogest for oestrus suppression in competition horses is believed to be widespread in some equestrian disciplines, and can be administered continuously for several months during a competition season. To examine whether altrenogest has any anabolic or other potential performance enhancing properties that may give a horse an unfair advantage, we examined the effect of oral altrenogest (0.044 mg/kg), given daily for a period of eight weeks, on social hierarchy, activity budget, body-mass and body condition score of 12 sedentary mares. We concluded that prolonged oral administration of altrenogest at recommended dose rates to sedentary mares resulted in no effect on dominance hierarchies, body mass or condition score. 相似文献
19.
Hodgson D Howe S Jeffcott L Reid S Mellor D Higgins A 《Veterinary journal (London, England : 1997)》2005,169(3):322-325
Oral administration of altrenogest for oestrus suppression in competition horses is believed to be widespread in some equestrian disciplines, and can be administered continuously for several months during a competition season. To examine whether altrenogest has any anabolic or other potential performance enhancing properties that may give a horse an unfair advantage, we examined the effect of oral altrenogest (0.044 mg/kg), given daily for a period of eight weeks, on social hierarchy, activity budget, body-mass and body condition score of 12 sedentary mares. It was concluded that prolonged oral administration of altrenogest at recommended dose rate to sedentary mares had no effect on dominance hierarchies, body-mass or condition score. 相似文献
20.
RD Gama WL Vianna ME Pinese A de Campos Rosseto A de Sant''Anna Moretti 《Reproduction in domestic animals》2005,40(5):433-435
The use of hormonal protocols in puberty induction and synchronization of oestrus has lead to an increase in the efficiency of replacement gilts. The aim of this study was to evaluate different doses of porcine LH in precocious puberty induction and oestrus synchronization in a homogeneous group of gilts. Sixty-seven homogeneous prepubertal gilts (Camborough 22) at 137 +/- 4 days of age and 87 +/- 7 kg were treated with three different hormonal protocols: T1--600 UI of equine chorionic gonadotrophin (eCG; Novormon) and after a 72-h period 5 mg of LH (Lutropin); T2--600 UI of eCG and a 72-h period 2.5 mg of LH; T3--600 UI of eCG and a 72-h period 1.25 mg of LH. The ovaries were examined at slaughter, on day 6 after the hormonal treatment. There were no statistical differences (p > 0.05) between the different LH doses in the percentage of the detected oestrus (T1 = 42.85%; T2 = 60.87%, T3 = 52.18%), oestrus duration (T1 = 41.44 +/- 16.30 h; T2 = 48.57 +/- 16.29 h, T3 = 39.33 +/- 11.42 h), number of corpora lutea (T1 = 9.61 +/- 5.43; T2 = 9.86 +/- 3.32, T3 = 8.13 +/- 5.52) and percentage of animals presenting ovarian cystic degeneration (T1 = 33.33%; T2 = 39.13%, T3 = 39.13%). The T2 (2.5 mg of LH) presented the lowest dispersion (p < 0.05) of the LH-ovulation interval (T1 = 37.17 +/- 4.07 h; T2 = 38.26 +/- 2.84 h; T3 = 36.25 +/- 5.69 h). The LH dose reduction to 2.50 and 1.25 mg presented equal results with the recommended dose of 5.0 mg, and could be used in the precocious induction of oestrus in gilts. The 2.5-mg LH dose showed the lowest dispersion of ovulation and it can be used in fixed-time artificial insemination programmes. 相似文献