POSTWEANING VAGINAL MUCUS CONDUCTIVITY AND BREEDING PERFORMANCE AT ARTIFICIAL INSEMINATION IN SWINE

1990 ◽  
Vol 70 (2) ◽  
pp. 451-457 ◽  
Author(s):  
JEAN-PIERRE CHARUEST ◽  
JACQUES J. DUFOUR ◽  
YVAN SAVOIE ◽  
YVONNE M. RICHARD
Keyword(s):  
Artificial Insemination ◽  
Proper Time ◽  
Breeding Performance ◽  
Once Daily ◽  
Unit Scale ◽  
Estrus Detection ◽  
Unit Increase ◽  
Parity Number ◽  
Natural Service ◽  
Sexually Mature

Two experiments were conducted to test the efficiency of using vaginal mucus conductivity measurements in sows to fix the breeding time for artificial insemination (Al). The apparatus used was the Heat Detector No 113 from Mitogiken Ltd. (Group Sumimoto, Toronto). In exp. 1, 57 crossbred sows were measured three times daily from 1 to 5 d after weaning (day 0) in order to characterize the pattern of vaginal mucus conductivity before estrus. In all females onset of estrus was checked twice daily in the presence of a sexually mature boar. Sow vaginal mucus conductivity readings (12 unit scale) averaged 4.1 units at weaning and 7.4 units at estrus. Only 60% of the sows reached the manufacturer's recommendation of 7–9 units at estrus. Conductivity increased by an average of three units between weaning and estrus in 62% of the sows. In exp. 2,201 crossbred sows were assigned randomly according to parity number to three groups. The first group was bred by Al when the sows showed a three-unit increase in vaginal mucus conductivity after weaning, without estrus detection by the boar. The two other groups of sows were checked once daily for onset of estrus using a mature boar, with a group bred by natural service and the other by Al. There was a large amount of variation between and within sows in absolute vaginal mucus conductivity readings. Only 29.3% of sows were inseminated at a reading of 7–9 units while 53.7% of the sows showed a differential of + 3 units after weaning, among which 50% reached a reading of 7–9 units at breeding. Sixteen (41.5%) sows showed behavioral estrus signs at an avg. conductivity reading of 4.0 units, without reaching the + 3 unit differential in conductivity. Conception rate and litter size of sows bred at a + 3 unit differential in conductivity were lower than the two groups of sows which were heat checked with a boar. No difference was observed among the latter two groups. The results indicated that vaginal mucus conductivity alone, without the use of a boar is not a reliable tool to fix the proper time to inseminate sows. Key words: Vaginal conductivity, artificial insemination, estrus, postweaning, sow

scholarly journals PSX-28 Using estrus detection patches or a ram wearing a marking harness to monitor estrus in synchronized hair sheep ewes

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 460-460
Author(s):  
Robert W Godfrey ◽  
Sue A Lakos
Keyword(s):  
Artificial Insemination ◽  
Post Partum ◽  
Hair Sheep ◽  
Cumulative Percentage ◽  
Estrous Synchronization ◽  
Estrus Detection ◽  
Visual Observations

Abstract Determining when a ewe is in estrus is important when using estrous synchronization and artificial insemination in sheep. This study was conducted to compare the efficacy of estrus detection patches (Estrotect™) and rams wearing marking harnesses for monitoring estrus in synchronized hair sheep ewes. St. Croix White (STX) ewes (3.5 ± 0.3 y of age, 89.7 ± 2.2 d post-partum) were synchronized using progesterone releasing inserts (Eazi-Breed™ CIDR) for 12 d. On the day of CIDR removal (d 1) ewes were administered prostaglandin (Lutalyse®; 15 mg i.m.) and placed with fertile STX rams in 0.55 ha pastures. One group of ewes (n =10; MH) was placed with a ram wearing a marking harness and a second group (n = 16; EP) had estrus detection patches placed on their rumps before being placed with a ram without a harness. Estrus detection was conducted using visual observations twice a day through d 7. A ewe was considered to be in estrus when crayon marks were observed on the rump or the patch was activated, based on product guidelines. Cumulative percentage of ewes in estrus was analyzed using the CATMOD procedure with treatment, day and the interaction in the model. All patches stayed in place on the EP ewes through d 7. By d 4 90% of MH ewes and 75% of EP ewes had been observed in estrus (P < 0.05). By d 7 90% of MH ewes and 81.25% of EP ewes had been observed in estrus (P < 0.05). With costs of $1.33 per patch or $29.33 for one harness and crayon the patches may be more economical when dealing with up to 21 ewes per ram. Estrus detection patches can be used on hair sheep ewes to detect estrus just as effectively as a ram with a marking harness.

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.

Use of sex-sorted sperm in lactating dairy cows upon estrus detection or following timed artificial insemination

2013 ◽  
Vol 143 (1-4) ◽  
pp. 19-23 ◽  
Author(s):  
M.F. Sá Filho ◽  
M.F. Mendanha ◽  
R.V. Sala ◽  
F.J. Carvalho ◽  
L.H.C. Guimarães ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Lactating Dairy Cows ◽  
Estrus Detection ◽  
Timed Artificial Insemination

A COMPARISON OF FRESH AND FROZEN SEMEN IN THE INSEMINATION OF CONFINED SHEEP

1979 ◽  
Vol 59 (4) ◽  
pp. 685-691 ◽  
Author(s):  
G. A. LANGFORD ◽  
G. J. MARCUS ◽  
A. J. HACKETT ◽  
L. AINSWORTH ◽  
H. F. PETERS ◽  
...  
Keyword(s):  
Litter Size ◽  
Reproductive Performance ◽  
Artificial Insemination ◽  
Embryonic Mortality ◽  
Frozen Semen ◽  
Serum Gonadotropin ◽  
Early Embryonic Mortality ◽  
The Difference ◽  
Natural Service ◽  
Fresh Semen

The reproductive performance of crossbred sheep maintained in total confinement was compared after artificial insemination with fresh or frozen semen. Estrus was synchronized with progestagen-impregnated vaginal sponges and pregnant mares’ serum gonadotropin. Inseminations were performed 54 and 60 h after sponge removal. The fertility of ewes inseminated with fresh semen was significantly higher than of ewes inseminated with frozen semen. Conception rates, lambing rates and litter size were 83%, 78% and 2.2 using fresh semen and 65%, 43% and 1.8 using frozen semen. In a group of similar ewes bred by natural service, the lambing performance was comparable to that obtained with fresh semen. The difference between conception and lambing rates suggests an increase in early embryonic mortality when breeding with frozen semen and confirms the need for improved frozen semen technology.

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