Intravaginal SC-9880-progesterone treatments in the synchronization of oestrus in cyclic sheep

1971 ◽  
Vol 76 (3) ◽  
pp. 361-363 ◽  
Author(s):  
I. Gordon ◽  
P. G. Maher
Keyword(s):  
Breeding Season ◽  
Additional Dose ◽  
Mating Response ◽  
Natural Service

SUMMARYThe mating response and lambing outcome in fifty-three sheep was studied after treatment with intravaginal sponges during October (normal breeding season). Bach pessary carried a dose of 30 mg ‘Cronolone’ (9α-fluoro-11β-hydroxy-17α-acetoxyprogesterone; SC-9880, G. D. Searle) in finely dispersed form and was inserted for 14 days. Half the number of pessaries carried an additional dose of 400 mg progesterone. Breeding was by natural service, using 10% rams. Ninety per cent of the fifty ewes bred immediately after treatment conceived; the average number of lambs/conception was 1·9. Sheep treated with ‘Cronolone’/progesterone pessaries showed a marginal and non-significant advantage over those treated with ‘Cronolone’. The application was effective in ensuring the birth of most lambs (87% of total) within a period of 1 week.

SC-9880-progesterone applications in the induction of early breeding in sheep

1971 ◽  
Vol 76 (3) ◽  
pp. 343-346 ◽  
Author(s):  
I. Gordon
Keyword(s):  
Intramuscular Injection ◽  
Additional Dose ◽  
Mating Response ◽  
Single Intramuscular Injection ◽  
June July ◽  
Natural Service

SUMMARYThe mating response and lambing outcome was studied in 584 sheep in twentyeight farm flocks after treatment with progestagen impregnated intravaginal sponges and PMS during June/July (period of late anoestrus). Each pessary carried a dose of 30 mg ‘Cronolone’ (9α-fluoro-11β-hydroxy-17α-acetoxy-progesterone; SC-9880, G. D. Searle) in finely dispersed form; half the number of pessaries carried an additional dose of 400 mg progesterone. Intravaginal treatment was for 12 days; a single intramuscular injection of 500 i.u. PMS (Burrough's Wellcome) was made at pessary withdrawal. Breeding was by natural service, using 10% rams. The response was 98·8% bred in the 4 days after treatment, 61·2% conceptions in those served and an average of 1·65 lambs/conception. This resulted in the birth, within the period of about 1 week, of 100 ‘early’ lambs for every 100 ewes exposed to rams. The addition of 400 mg progesterone to pessaries or the injection of a dose of 5 mg progesterone at sponge withdrawal did not improve response beyond that found with ‘Cronolone’ alone.

scholarly journals 202 Repeatability of estrus detection patch readings and relationship with breeding success

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 30-31
Author(s):  
Vitor R G Mercadante ◽  
Robin R White ◽  
Heather L Bradford ◽  
Nicholas W Dias ◽  
Claire Timlin ◽  
...  
Keyword(s):  
Pregnancy Rate ◽  
Breeding Season ◽  
False Negative ◽  
Fixed Time ◽  
True Negative ◽  
Full Dataset ◽  
Activated State ◽  
Estrus Detection ◽  
Virginia Department ◽  
Natural Service

Abstract The objective of this study was to assess how well estrus detection patch readings correlated to successful AI breedings and to characterize the within-cow repeatability of estrus detection patch readings across breeding seasons. Data from the Virginia Department of Corrections beef cattle herds were collated for 7 locations over 7 years, with 2 calving seasons per year. Data from Spring of 2011 were missing. The full dataset contained 19,253 individual animal observations, of which 2,389 observations were omitted for failure to report estrus detection patch data. The relationship between estrus patch reading and pregnancy rate to fixed-time AI and subsequent natural service pregnancy rate was assessed by calculating the sensitivity and specificity of patch readings within each location during each breeding season. A true positive was defined as a patch activating and a cow being confirmed pregnant. A true negative was a patch remaining in the non activated state and a cow being confirmed open. A false positive was defined as a patch activating and a cow being confirmed open. A false negative was a patch failing to activate and a cow being confirmed pregnant. Pregnancy rate to AI sensitivity ranged from 0.2 to 1 with a mean of 0.583. Specificity ranged from 0 to 1 with a mean of 0.525. Subsequent natural service pregnancy rate), ranges in sensitivity (0.197 to 1.00, mean 0.563) and specificity (0 to 1, mean 0.545) were similar. Of the 6,249 animals with usable patch data, 934 never presented with an activated patch and 2,064 presented with an activated patch every breeding season. The remaining 3,251 animals averaged presenting with an activated patch 47% of the time and a non-activated patch 46% of the time. Odds of getting pregnant by AI for cows that always flag with the heat patch were 0.415.

88 Impacts of Body Condition Score at Initiation of the Breeding Season on Reproductive Performance and Overall Productivity of Bos Taurus and B. Indicus Beef Cows

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 48-48
Author(s):  
Alice Brandão ◽  
Reinaldo F Cooke ◽  
G Cliff C Lamb ◽  
José Luiz Vasconcelos ◽  
Ky G Pohler
Keyword(s):  
Breeding Season ◽  
Body Condition ◽  
Bos Taurus ◽  
Body Condition Score ◽  
Beef Cows ◽  
Pregnancy Rates ◽  
Condition Score ◽  
Pregnancy Status ◽  
Calving Rate ◽  
Natural Service

Abstract Responses of Bos taurus (BT) and B. indicus (BI) beef cows were compared according to their body condition score (BCS) at initiation of breeding season. Cows were assigned to an estrus synchronization + AI protocol and classified as BCS < 5.0 (LBCS, BT, n = 158; BI, n = 248) or BCS ≥ 5.0 (HBCS; BT, n = 173; BI, n = 122). Pregnancy status was verified via transrectal ultrasonography at 30 and 40 d after AI for BI and BT cows, respectively. All BT cows were exposed to natural service for 50 d (beginning 18 d after AI), and all non-pregnant BI cows were immediately exposed to natural service for 60 d. Pregnancy rates to AI did not differ (P ≥ 0.16) between HBCS or LBCS cows (60.9 vs. 53.5% for BT; 37.0 vs. 31.4% for BI; respectively). Pregnancy rates to natural service were greater (P = 0.03) in HBCS BT cows compared with LBCS (82.7 vs. 67.9%; respectively) but did not differ in BI cows (78.9 vs. 71.5%; respectively). Calving rate was greater (P < 0.03) in HBCS cows, which also calved earlier (P < 0.01) compared with LBCS (93.7 vs. 85.1% in BT, 83.6 vs. 73.3% in BI; respectively). HBCS Cows weaned more (P ≤ 0.05) calves compared with LBCS, which were older (P ≤ 0.04) (215 vs. 211 d in BT, 219 vs. 209 d in BI; respectively) and heavier (P ≤ 0.09) at weaning (258 vs. 252 kg in BT, 213 vs. 203 d in BI; respectively). Lastly, kg of calf weaned/cow was greater (P ≤ 0.03) in HBCS cows compared with LBCS (221 vs. 200 d in BT, 159 vs. 129 d in BI; respectively). Therefore, HBCS cows had greater reproductive efficiency and overall productivity, and this was observed in both BT and BI.

Effect of postpartum bull exposure on calving interval of first-calf heifers bred by natural service

1994 ◽  
Vol 74 (1) ◽  
pp. 153-154 ◽  
Author(s):  
C. L. Larson ◽  
H. L. Miller ◽  
T. B. Goehring
Keyword(s):  
Key Words ◽  
Breeding Season ◽  
Calving Interval ◽  
Early Postpartum ◽  
Condition Score ◽  
Natural Service

Ninety-four first calf heifers were utilized to evaluate the effect of bull exposure on the calving interval. Heifers were alternately assigned after calving to a pasture containing epididymectomized bulls for 60 d or were not exposed. Thirty-five days prior to the breeding season the bulls were removed and the two groups co-mingled. Bull-exposed heifers had a 9-d increase in calving interval and a 7-d delay in average calving date compared to unexposed heifers (P < 0.05). Bull exposure early postpartum did not shorten the calving interval of heifers in condition score of 5 or better at calving and bred by natural service under the conditions of this study. Key words: Bull exposure, first-calf heifers, reproduction, calving interval, postpartum

Commercial equine production in New Zealand. 1. Reproduction and breeding

2020 ◽  
Vol 60 (18) ◽  
pp. 2145 ◽  
Author(s):  
Erica K. Gee ◽  
Chris W. Rogers ◽  
Charlotte F. Bolwell
Keyword(s):  
New Zealand ◽  
Breeding Season ◽  
Management Practices ◽  
High Fertility ◽  
Structured Systems ◽  
Frozen Semen ◽  
Good Body Condition ◽  
Natural Service ◽  
Artificial Vagina ◽  
Careful Management

The Thoroughbred and Standardbred studbooks are the largest in New Zealand, where the production of horses is pasture based. Each racing studbook is closed, and both have well structured systems in place for recording breeding data. There are significant pressures on the Thoroughbred and Standardbred breeding industries with declining broodmare numbers, and increasingly large book sizes for popular stallions. The breeding season for Thoroughbreds is very short, with disparity between the official breeding season and the physiologic breeding season for mares. These issues are confounded by variable gestation lengths of mares, making it difficult for mares to maintain yearly foaling patterns. However, the reproductive efficiency of Thoroughbred mares is improving, mainly due to veterinary and stud management practices such as those to ensure that dry mares are cycling at the start of the breeding season, foaling mares are bred on foal heat, and that mares are kept in good body condition at breeding. There is also a bias towards breeding younger mares with high fertility in preference to older mares, unless they have desired genetics or successful offspring. Careful management of popular Thoroughbred stallions ensures that large books of mares can be covered by natural service. In contrast, Standardbred stallions are collected every-other-day using an artificial vagina, allowing the breeding of mares at distant locations by artificial insemination, using chilled or frozen semen. Breeding horses kept at pasture under New Zealand conditions requires excellent stud management and veterinary management to achieve good outcomes.

The effect of method of breeding on reproductive performance in indigenous goats (Capra prisca) mated at the beginning of the breeding season

1989 ◽  
Vol 49 (2) ◽  
pp. 291-297 ◽  
Author(s):  
D. Zygoyiannis ◽  
N. Katsaounis ◽  
G. Karatzas
Keyword(s):  
Breeding Season ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Gestation Length ◽  
Mating Group ◽  
Natural Pasture ◽  
Frozen Semen ◽  
Natural Mating ◽  
Natural Service ◽  
Fresh Semen

ABSTRACTNinety-nine indigenous Greek goats (Capra prisca) on natural pasture were used to study reproductive performance as affected by method of breeding. At the beginning of the breeding season oestrus was induced with 45 mg fluorogestone acetate-impregnated vaginal sponges and 300 to 500 i.u. PMSG, given on day 15. The animals were separated into groups of 33 for mating: (i) by natural service (natural mating); (2) by artificial insemination with fresh semen (AI fresh); and (3) by insemination with frozen semen (AI frozen). Alpine bucks and Alpine semen were used for natural mating and AI of does.No effect of method of breeding was found on gestation length and sex ratio. Reproductive performance was significantly affected by method of breeding; at 21 days after insemination, fertility of does bred with fresh semen (69·7%) was comparable with that obtained with natural mating (72·7%) but the fertility of does bred with frozen semen (48·5%) was much lower. This difference was statistically significant at kidding (P < 0·05). Litter size was 2·14 and 1·86 (P < 0·05) for the AI fresh and AI frozen groups, respectively, and was 1·96 for the natural mating group. More multiple litters were obtained with the AI fresh group (P < 0·05). It is concluded that, induction and synchronization of oestrus and ovulation at the beginning of the breeding season gave reproductive performance with fresh semen comparable to that obtained with natural service, but use of frozen semen gave unsatisfactory results.

scholarly journals 108CRYOPRESERVATION OF GERMPLASM FROM HERITAGE BREEDS OF DOMESTIC LIVESTOCK: SEASONAL EFFECTS ON SUPEROVULATION RESPONSE AND EMBRYO PRODUCTION

2004 ◽  
Vol 16 (2) ◽  
pp. 176 ◽  
Author(s):  
D. Matsas ◽  
V. Huntress ◽  
H. Levine ◽  
G. Saperstein ◽  
E.W. Overstrom
Keyword(s):  
Genetic Diversity ◽  
Breeding Season ◽  
Gulf Coast ◽  
Prostaglandin F2α ◽  
Seasonal Effects ◽  
Preimplantation Stage ◽  
Domestic Livestock ◽  
Natural Service ◽  
Successful Production

There is an urgent need to preserve the genetic diversity of rare breeds of domestic livestock. However, it is unknown if conventional superovulation methods are effective in unimproved breeds. The establishment of germplasm cryostorage banks requires the ability to produce viable preimplantation stage embryos. To our knowledge, we describe here the first successful production and cryopreservation of embryos from Gulf Coast Native (GCN) sheep and Tennessee Myotonic (TM) goats. Mature GCN ewes and TM does were synchronized (prostaglandin F2α, 7.5–10mg i.m.) and all TM does, and some GCN ewes, were treated with progesterone (20mg sq, 5×on alternate days, prior to FSH treatment, then 10mg i.m. on second day of FSH treatment). Animals were superovulated (FSH, 50–40–30mg bid i.m., decreasing over 3 days) both in April (cycling) and June (anestrous). Females were bred by natural service with a proven male over 24hr, and embryos were collected surgically from the uterus on Day 7. FSH-stimulated cycling TM does produced a total of 15.3±3.0CL and 10.7±7.2 morulae/animal, whereas FSH-treated anestrous TM does yielded 9.0±2.8CL and 7.0±8.4 embryos per animal. Recovered goat embryos were morphologically of good-excellent quality, and were cryopreserved using a conventional multi-step freezing protocol. Cycling GCN ewes responded to FSH simulation and produced 9.7±2.5CL per animal, whereas the ovaries of non-cycling ewes did not respond to exogenous FSH treatment (0CL). This report documents that TM does will effectively respond to FSH superovulation treatment and produce viable embryos during the breeding season and during the anestrous period. In contrast, GCN ewes appear to respond only to exogenous FSH during the breeding season. Collectively, these results demonstrate that the TM and GCN landrace breeds of goats and sheep display differential responses to hormone manipulation; yet, with breed-optimized protocols, preimplantation stage embryos can be obtained for long-term cryostorage of germplasm of heritage breeds of livestock. Supported by and in partnership with SVF Foundation.

Observation on the breeding biology of Polypedates teraiensis (Dubois, 1987) (Amphibia: Rhacophoridae)

2017 ◽  
Vol 17 (1) ◽  
pp. 25-32
Author(s):  
Jacinta Lalchhanhimi ◽  
Lalremsanga H.T.
Keyword(s):  
Sexual Dimorphism ◽  
Breeding Season ◽  
Sound Production ◽  
Reproductive Function ◽  
Breeding Biology ◽  
Tree Frog ◽  
University Campus ◽  
Morphometric Measurements ◽  
Advertisement Calls ◽  
Males And Females

The breeding biology of tree frog, Polypedates teraiensis was studied during the breeding season at Mizoram University Campus. It was found that sound production by male during the breeding season was primarily a reproductive function and advertisement calls attract females to the breeding areas and announce other males that a given territory is occupied. The aim of this study was to provide the detailed information on the breeding behaviour and the advertisement calls of Polypedates teraiensis. The morphometric measurements of the amplecting pairs (males and females) for sexual dimorphism along with clutch sizes were also studied.

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