Factors affecting the size of ovulatory follicles and conception rate in high-yielding dairy cows

2016 ◽  
Vol 85 (4) ◽  
pp. 747-753 ◽  
Author(s):  
A. Mokhtari ◽  
M. Kafi ◽  
M.J. Zamiri ◽  
R. Akbari
Keyword(s):  
Dairy Cows ◽  
Conception Rate ◽  
Factors Affecting ◽  
Ovulatory Follicles

scholarly journals Factors affecting conception rate after the first artificial insemination in a private dairy cattle farm in North Algeria

2020 ◽  
Vol 13 (12) ◽  
pp. 2608-2611
Author(s):  
Samir Souames ◽  
Zahra Berrama
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Odds Ratio ◽  
Specific Effect ◽  
Conception Rate ◽  
Multivariable Logistic Regression Model ◽  
Cattle Farm ◽  
Factors Affecting ◽  
Factors Influencing ◽  
North Algeria

Aim: This study analyzed risk factors influencing the conception rate at the first artificial insemination (CR1) in dairy cows reared in the plain of Mitidja, which is considered a major dairy region in North Algeria. Materials and Methods: A total of 1054 lactations were used in the relational study of fertility conducted using the multivariable logistic regression model using the odds ratio (OR). Results: The breeding season had a specific effect on fertility; the first service was often followed by pregnancy when performed during autumn (AUT) (OR=1.67, p<0.05) and spring (SPR) (OR=1.65, p<0.05). The chances of obtaining conception during the first service increased significantly for a waiting period (WP) (interval between calving and time to first service) of 50-100 days postpartum (DPP) (OR=1.67, p<0.05). Conclusion: From this study, it can be concluded that no specific effect was observed relative to the breed and parity. Furthermore, CR1 significantly increased after summer calving when the first services were performed during SPR and AUT and a WP after 50 DPP.

Factors affecting conception rate after artificial insemination and pregnancy loss in lactating dairy cows

2004 ◽  
Vol 84 (3-4) ◽  
pp. 239-255 ◽  
Author(s):  
Ricardo C. Chebel ◽  
José E.P. Santos ◽  
James P. Reynolds ◽  
Ronaldo L.A. Cerri ◽  
Sérgio O. Juchem ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Pregnancy Loss ◽  
Conception Rate ◽  
Factors Affecting ◽  
Lactating Dairy Cows

Climate factors affecting conception rate of high producing dairy cows in northeastern Spain

2007 ◽  
Vol 67 (8) ◽  
pp. 1379-1385 ◽  
Author(s):  
I. García-Ispierto ◽  
F. López-Gatius ◽  
G. Bech-Sabat ◽  
P. Santolaria ◽  
J.L. Yániz ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Conception Rate ◽  
Climate Factors ◽  
Factors Affecting

Factors Affecting the Thyroid Uptake of I131 in Dairy Cows

1957 ◽  
Vol 16 (2) ◽  
pp. 318-327 ◽  
Author(s):  
E. W. Swanson ◽  
F. W. Lengemann ◽  
R. A. Monroe
Keyword(s):  
Dairy Cows ◽  
Factors Affecting ◽  
Thyroid Uptake

scholarly journals Effect of the Temperature-Humidity Index on Body Temperature and Conception Rate of Lactating Dairy Cows in Southwestern Japan

2011 ◽  
Vol 57 (4) ◽  
pp. 450-456 ◽  
Author(s):  
Hisashi NABENISHI ◽  
Hiroshi OHTA ◽  
Toshihumi NISHIMOTO ◽  
Tetsuo MORITA ◽  
Koji ASHIZAWA ◽  
...  
Keyword(s):  
Body Temperature ◽  
Dairy Cows ◽  
Conception Rate ◽  
Temperature Humidity Index ◽  
Lactating Dairy Cows ◽  
Humidity Index

scholarly journals Influence of seasonality, timing of insemination and rectal temperature on conception rate of crossbred dairy cows

2016 ◽  
Vol 37 (1) ◽  
pp. 155 ◽  
Author(s):  
Fransérgio Rocha de Souza ◽  
Carla Cristian Campos ◽  
Natascha Almeida Marques da Silva ◽  
Ricarda Maria dos Santos
Keyword(s):  
Dairy Cows ◽  
Rectal Temperature ◽  
Artificial Insemination ◽  
Dairy Farm ◽  
Fixed Time ◽  
Conception Rate ◽  
Digital Thermometer ◽  
Pregnancy Diagnosis ◽  
Chi Squared

This study aimed to evaluate the effects of rectal temperature (RT) on conception rate (CR), as well as the effects of seasonality (spring-summer vs. autumn-winter) and timing of artificial insemination (AI) (morning vs. afternoon) on RT and CR in crossbred dairy cows (Holstein x Gyr). The experiment was conducted on a dairy farm in Centralina, MG, where 1,219 conventional and fixed-time inseminations were analyzed. The RT was measured immediately before AI using a digital thermometer. Pregnancy diagnosis was performed using ultrasonography between 28 and 60 days after AI. T The effects of seasonality and timing of AI on RT were analyzed with a Mann-Whitney U test and the effects of RT (above or below the average), seasonality and timing of AI on CR were analyzed with a Chi-squared test, both using the SAS program. The RT average was 39.4°C. Cows with RT ? 39.4°C had lower CR than cows with RT < 39.4°C (25.78% vs. 32.54%; P = 0.0096). During spring-summer, cows had higher RT (39.44°C ± 0.025 vs. 39.27°C ± 0.022; P < 0.0001) and lower CR (25.49% vs. 31.75%; P = 0.0146) compared with autumn-winter. Cows inseminated in the morning had lower RT (38.96°C ± 0.022 vs. 39.60°C ± 0.018; P < 0.0001) and higher CR (32.86% vs. 26.06%; P = 0.0102) than cows inseminated in the afternoon. In conclusion, crossbred dairy cows with rectal temperature equal to or greater than 39.4°C had lower conception rate. Moreover, rectal temperature and conception rate were affected by seasonality and insemination time.

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