scholarly journals Evaluations for service-sire conception rate for heifer and cow inseminations with conventional and sexed semen

2011 ◽  
Vol 94 (12) ◽  
pp. 6135-6142 ◽  
Author(s):  
H.D. Norman ◽  
J.L. Hutchison ◽  
P.M. VanRaden
Keyword(s):  
Conception Rate ◽  
Sexed Semen ◽  
Sire Conception Rate

PSV-5 Relationship between sire conception rate, sperm motility, sperm SERPINA5 relative concentration, and in vitro produced embryos in dairy bulls

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 310-310
Author(s):  
Saulo Menegatti Zoca ◽  
Julie Walker ◽  
Taylor Andrews ◽  
Adalaide C Kline ◽  
Jerica J Rich ◽  
...  
Keyword(s):  
Embryo Development ◽  
Sperm Motility ◽  
Relative Concentration ◽  
Early Embryo ◽  
Conception Rate ◽  
Cleavage Rate ◽  
Blastocyst Rate ◽  
Positive Correlations ◽  
Sire Conception Rate

Abstract Sire conception rate (SCR) is a field measure of fertility among bulls, but it can be influenced by several factors (Sperm transport, sperm-egg binding, early embryo development, etc). The objective of this study was to evaluate the relationship between SCR, sperm motility, SERPINA5 concentrations, and in vitro embryo development. Measurements were performed in 19 bulls with SCR values ranging from -7.7 to 4.45. For each bull, an aliquot of frozen-thawed semen was used for analyses of total (TMOT) and progressive (PROG) motility. Remaining semen was fixed with 2% formaldehyde, and concentration of SERPINA5 was determined by immunolocalization (antibody SERPINA5/Dylight405; PA5-79976-Invitrogen / ab201798-Abcam). Mean fluorescence intensity was determined in ~200 sperm heads/bull. Approximately 149 oocytes/bull were fertilized in vitro for embryo development analysis (cleavage and blastocyst rates). Statistical procedures were performed in SAS (9.4) using the procedures CORR for correlations (SCR, TMOT, PROG, SERPINA5, cleavage and blastocyst) and GLIMMIX for comparison of “field-fertility” (SCR divided in HIGH or LOW) and “field-embryo-fertility” (LOW-SCR sires were divided based on blastocyst rate (HIGH or LOW) resulting in two classifications; LOW-HIGH≥31% and LOW-LOW≤26%, respectively). There were positive correlations (P < 0.05) between cleavage-blastocyst (r=0.50), SERPINA5-cleavage (r=0.48), and TMOT-PROG (r=0.76). Sire SCR was not associated with SERPINA5, TMOT, PROG, cleavage and blastocyst rate (P > 0.52). Among LOW-SCR sires, LOW-LOW sires (-4.83±0.60) tended to have a better SCR score than LOW-HIGH (-6.18±0.42) sires (P = 0.08), but there were no differences (P > 0.43) between LOW-HIGH, LOW-LOW, and HIGH sires for SERPINA5, TMOT, PROG, and cleavage. In conclusion, some LOW SCR sires have good embryo development indicating a different mechanism for their low SCR; however, these differences in SCR could not be explained by TMOT, PROG, SERPINA5, cleavage and blastocyst. There were, however, positive correlations between cleavage-blastocyst rate, and SERPINA5-cleavage rate.

scholarly journals Influences of sire conception rate on pregnancy establishment in dairy cattle†

2018 ◽  
Vol 99 (6) ◽  
pp. 1244-1254 ◽  
Author(s):  
M Sofia Ortega ◽  
João G N Moraes ◽  
David J Patterson ◽  
Michael F Smith ◽  
Susanta K Behura ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Conception Rate ◽  
Sire Conception Rate

Evaluation of bull fertility of Sahiwal breeding bulls

2016 ◽  
Author(s):  
B. C. Naha ◽  
A. K. Chakravarty ◽  
M. A. Mir ◽  
M. Bhakat ◽  
A. P. Singh ◽  
...  
Keyword(s):  
Conception Rate ◽  
National Dairy Research Institute ◽  
Sire Conception Rate ◽  
Dairy Research ◽  
Research Institute

In the present investigation, bull fertility of Sahiwal breeding bulls has been studied. The study was conducted on records of 43 Sahiwal bulls maintained under 8 sets of Sahiwal breeding project at ICAR- National Dairy Research Institute, Karnal (India). The data on bull fertility of Sahiwal breeding bulls during 27 years (1987-2013) were analysed. The presented study revealed that the average conception rate based on first AI and overall conception rate of Sahiwal breeding bulls were estimated as 45.95% and 46.38 %. Average sire conception rate of Sahiwal breeding bulls range from – 2% to + 3% and – 2% to + 4 % for conception rate based on first AI and overall conception rate. It has been observed that the average conception rate based on first AI was lower as compare to overall conception rate and higher conception rate of Sahiwal breeding bulls is having higher sire conception rate.

Association of CRISP2, CCT8, PEBP1 mRNA abundance in sperm and sire conception rate in Holstein bulls

2011 ◽  
Vol 76 (3) ◽  
pp. 570-577 ◽  
Author(s):  
A. Arangasamy ◽  
V.R. Kasimanickam ◽  
J.M. DeJarnette ◽  
R.K. Kasimanickam
Keyword(s):  
Conception Rate ◽  
Mrna Abundance ◽  
Holstein Bulls ◽  
Sire Conception Rate

PSV-8 Sire field fertility does not correlate with sire conception rate (SCR) score

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 304-305
Author(s):  
Gessica A Franco-Johannsen ◽  
Marcos Henrique C Pereira ◽  
M Sophia Ortega ◽  
Sydney T Reese ◽  
Jose Luiz M Vasconcelos ◽  
...  
Keyword(s):  
Pregnancy Rate ◽  
Pregnancy Loss ◽  
Current Method ◽  
Conception Rate ◽  
Main Hypothesis ◽  
Significant Challenge ◽  
Fertility Status ◽  
Sire Conception Rate ◽  
Individual Service ◽  
In Pregnancy

Abstract Accurate sire fertility evaluation remains a significant challenge in the livestock industry. Sire conception rate (SCR) has been used since 2008 in the dairy industry to rank sire fertility. The objective was to characterize individual sire pregnancy rate, pregnancy loss, and determine the correlation with the sire’s respective SCR. Our main hypothesis is that large variances in fertility parameters by sire cannot be explained by variance of the SCR values. Data from 6,570 timed artificial inseminations (AI) and 25,287 timed embryo transfers (ET) from 55 dairy farms were retrospectively analyzed to assess: pregnancy rate at day 30 (P30), pregnancy rate at day 60 (P60) and pregnancy loss (PL) during this interval. The effect of sire (AI: n = 39; ET: n = 81) for each reproductive parameter was evaluated. SCR records published prior to individual service were obtained to correlate with fertility parameters. For AI mating, pregnancy rate at P30 was 33.13% (2,177/6,570), and 27.6 % for P60 (1,815/6,570) and PL occurred in 16.6% (362/2,177) of pregnancies. Large variance was observed between sires for each parameter but no or negligible correlation (r < 0.2) with published SCR was observed. For ET, pregnancy rate at P30 was 47.8% (12,082/25,287) and 40.5% for P60 (10,246/25,287) with an overall PL of 15.2% (1,836/12,082). Similar to AI, all fertility parameters were highly variable among sires but no or negligible correlation (r < 0.03) with respective SCR was observed. In summary, the current method to evaluate sire fertility using SCR does not truly represent the field fertility status. Large variance in pregnancy loss between days 30 and 60 of gestation were observed among sires and these phenotypes should be considered when evaluating sire fertility to increase the score reliability.

scholarly journals Use of Sexed Semen in Indian Dairy Cattle: A Case Study

2018 ◽  
Vol 14 (3) ◽  
Author(s):  
P.C. Jethva ◽  
S.B. Patel
Keyword(s):  
Dairy Cattle ◽  
Field Condition ◽  
Conception Rate ◽  
Small Scale ◽  
Sexed Semen ◽  
Sorting Efficiency ◽  
Calf Rearing

This study was undertaken at the calf rearing project (CRP) of AMUL at Sarsa Village, Anand, Gujarat to assess the conception rate and sorting efficiency of imported sexed semen of HF bulls. In all, 127 pubertal crossbred heifers (b.wt. 250-300 kg) were artificially inseminated during the year 2016-17 using 172 sexed semen doses (few with repeat insemination), resulting in 68 pregnancies. The conception rate of sexed semen was found to be 39.53%. Out of 68 pregnant heifers, 2 heifers aborted and one heifer died before calving. Out of rest 65 animals that calved, 54 heifers delivered female calves, 9 had male calves and two were female stillbirth. Thus, sexed semen produced 86.15% female calves and 13.85 % male calves. This small scale study highlights the success of sexed semen under field condition in producing calves of the desired sex in high percentage.

368 CONCEPTION RATE AT FIRST ARTIFICIAL INSEMINATION WITH SEXED SEMEN OR CONVENTIONAL SEMEN IN CROSSBRED DAIRY COWS

2010 ◽  
Vol 22 (1) ◽  
pp. 340
Author(s):  
B. T. Gerhardt ◽  
L. D. P. Sinedino ◽  
A. P. Dourado ◽  
P. A. M. Alves ◽  
L. A. G. Nogueira
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Genetic Selection ◽  
Conception Rate ◽  
Control Group ◽  
Chi Square ◽  
Fertility Reduction ◽  
Estrus Detection ◽  
Sexed Semen ◽  
Experimental Group

The use of sexed semen in dairy cattle almost eliminates the birth of unwanted male calves and can lead to increased milk production by means of genetic selection exerted on the females. However, AI with sexed semen still presents several obstacles to overcome. Holstein-Zebu cows are responsible for 80% of the milk produced in Brazil. These crossbred animals are used extensively throughout the country because their physiologic and morphologic characteristics are compatible with milk production in the tropics which results in an economic performance advantage. The objective of this study is to evaluate the conception rates with sexed semen, comparing it to the use of non-sorted semen in crossbred dairy cows. In addition, two insemination times had been studied to determine the best timing for AI with the sexed semen. Both studies were carried out in the Experimental Station Seropedica of Pesagro-RJ, located in the state of Rio de Janeiro, Brazil. The experiment was done in 2008/2009 (January to April). In the first Trial 56 Holstein-Zebu females, composed of 1/2 to 7/8 Holstein genetics, were inseminated 12 h after estrus detection with non-sorted semen (control group n = 29, 14 heifers and 15 cows) or with sexed semen (experimental group n = 27, 13 heifers and 14 cows). The semen utilized was from the same bull and thawing was performed intravaginally. In the second trial, 55 females were inseminated only with sexed semen from the same bull, with thawing in water at 35°C, at two different times: 12 h after estrus observation (control group n = 27, 12 heifers, 4 primiparous, and 11 multiparous) and 15 h after estrus observation (experimental group n = 28, 12 heifers, 5 primiparous, and 11 multiparous). The pregnancy diagnoses were done by rectal palpation and transrectal CAT scan at Day 45. Statistical analyses had been done using Chi-square. The conception rate in the first trial was of 17.2% (5/29) for sexed semen and 53.8% (14/26) for non-sorted semen (P < 0.05). In the second trial, the conception rate was of 37.0% (10/27) for insemination with sexed semen, 12 h after estrus observation and 50.0% (14/28) for the females inseminated 15 h after estrus observation (P > 0.05). It is possible that one of the causes of fertility reduction with sexed semen is that sexed-sperm remain viable for a shorter time after the insemination. Inseminations with sexed semen done 15 h after estrus detection, which can be more synchronized with the time of ovulation, and when accompanied by closely controlling the thawing process, show results similar to those obtained with conventional semen.

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