Progesterone concentration in milk and blood serum and reproductiveefficiency of cows after Ovsynch treatment

Abstract

An experiment was conducted to investigate the effects of hormonal synchronization of ovulation on progesterone concentrations in milk and blood serum and on reproductive performance. Sixty Holstein-Friesian cows averaging 8000 L over 305 days of lactation were divided into 2 groups of 30 animals. One-factor ANOVA and a t-test of progesterone concentrations in venous serum and milk revealed that the lowest concentrations of progesterone in milk (Ovsynch 5.8 ± 1.0 ng/mL; control 4.5 ± 0.6 ng/mL) and blood serum (Ovsynch 1.3 ± 0.9 ng/mL; control 1.4 ± 0.5 ng/mL) in both groups were found on the day of estrus or artificial insemination (AI) (both P < 0.05). Increases in the concentrations of progesterone in milk (Ovsynch 17.6 ± 4.3 ng/mL; control 10.5 ± 1.9 ng/mL) and blood serum (Ovsynch 3.6 ± 1.1 ng/mL; control 4.0 ± 1.0 ng/mL) were observed on day 7 after AI (both P < 0.05). Concentrations of progesterone in milk and blood serum in nonpregnant cows were reduced on day 21 after AI. Assessment of reproductive performance revealed that the application of treatment shortened the duration of the service period (Ovsynch 76 days; control 83 days) and the calving interval (Ovsynch 376 days; control 382 days).

Progesterone concentration, pregnancy and calving rate in Simmental dairy cows after oestrus synchronisation and hCG treatment during the early luteal phase

“…The blood serum P4 concentrations found by us are lower than the level found in Holstein animals stimulated with hCG (Stevenson et al, 2012) but are comparable to concentrations detected in Holstein-Friesian dairy cows subjected to Ovsynch treatment (Vuković et al, 2016). Stevenson and Pulley (2012) reported that treatment with hCG (1000 IU) seven days after AI induces new luteal structures in about 70% of the treated animals and increases blood P4 level.…”

Fertility In Local Pesisir Cattle Following Ovsynch and Co-Synch Protocols Of Estrus Synchronization In West Sumatra

“…In the present study, the progesterone profiles appear in the lutheal phase of the estrus cycle. This is consistent with the early report of the higher progesterone concentration in blood serum during the late lutheal phase 3.6 ± 1.1 ng/ml of ovsynch protocol [37] and 1.59 ng/ml [38], [39]. Moreover, the progesterone concentration in blood is higher in the middle of the lutheal phase as compared to the earlier and late luteal phase [40].…”

“…The similar result reported that the treatment protocol of synchronization programme, 100 percent cows expressed estrus but the intensity varied from prominent, moderate and weak estrus sign [36]. Furthermore, weak estrus behaviour was assumed to be the cause of the decline in breeding efficiency in cattle, and vaginal temperature measurement might be effective for detecting estrus regardless of estrus behaviour [37].…”

Repeat Breeder İneklerde Presynch-10 ve Ovsynch Uygulamalarının Bazı Endometriyal Toll ve Nod Benzeri Reseptör Genlerinin Ekspresyonları Üzerine Etkileri

“…This also shows that they were in the same stage of the estrus cycle. In addition, the hormone levels in the other blood samples collected from G1 were compatible with the measured hormone levels with applications similar synchronization protocols in a different study [46] . On the other hand, progesterone levels measured during ovsynch were found to be different from our findings in another study.…”