Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cows
<b>Aim:</b> In this study, the effect of ovarian functions on estrus synchronization and pregnancy rates in Brown Swiss heifers and non-lactating cows synchronized with a modified ovsynch protocol was investigated.<p> <b>Materials and Methods:</b> The estrous cycle of h...
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Selcuk University Press
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| Series: | Eurasian Journal of Veterinary Sciences |
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| Online Access: | http://eurasianjvetsci.org/pdf.php3?id=1030 |
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| author | Mehmet Köse Tevfik Tekeli |
| author_facet | Mehmet Köse Tevfik Tekeli |
| author_sort | Mehmet Köse |
| collection | DOAJ |
| description | <b>Aim:</b> In this study, the effect of ovarian functions on estrus synchronization
and pregnancy rates in Brown Swiss heifers and
non-lactating cows synchronized with a modified ovsynch protocol
was investigated.<p>
<b>Materials and Methods:</b> The estrous cycle of heifers (n=60) and
cows (n=27) was synchronized with two injections of 150 mcg
d-cloprostenol (PGF<sub>2α</sub>) 14 days apart. Ovulation was induced
with the injection of 50 mcg lesirelin acetate (GnRH) at 48 hour
after the second PGF<sub>2α</sub>, and insemination (AI) was performed
between 16-20 h following the last injection. Corpus luteum and
follicle diameters were measured on days of PGF<sub>2α</sub> and GnRH injection
with ultrasound. Moreover, blood samples were collected
to assess plasma progesterone concentration on days of PGF<sub>2α</sub>
injection and on AI day (day 0) and subsequently on 7, 14 and 21
days. Pregnancy was checked on day 28 after AI.<p>
<b>Results:</b> Synchronization and pregnancy rates were found
87.4% and 36.8%, respectively. The most important factor reducing
the efficacy of protocol during synchronization period
was no luteal function in 6.89% of cows at time of the second
PGF<sub>2α</sub> injection. The affecting negatively on pregnancy rates in
synchronized cows was determined two main factors. 1- Lack of
luteal function on day 7 post-insemination (11.84% of synchronized).
2- Possible early embryonic deaths (11.84% of synchronized).<p>
<b>Conclusions:</b> It was concluded that the ovulation can be synchronized
with modified ovsynch protocol, consisting of two
PGF<sub>2α</sub> and one GnRH injection, and could be achieved to acceptable
pregnancy rate in Brown Swiss heifers and non-lactating
cows. |
| format | Article |
| id | doaj-art-6c47e9ab2f1e42dca2b77b0b37dbc368 |
| institution | Kabale University |
| issn | 1309-6958 2146-1953 |
| language | English |
| publisher | Selcuk University Press |
| record_format | Article |
| series | Eurasian Journal of Veterinary Sciences |
| spelling | doaj-art-6c47e9ab2f1e42dca2b77b0b37dbc3682025-02-03T11:25:39ZengSelcuk University PressEurasian Journal of Veterinary Sciences1309-69582146-195330253581030Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cowsMehmet Köse0Tevfik Tekeli1Dicle Üniversitesi, Veteriner Fakültesi, Doğum ve Jinekoloji Anabilim Dalı, Diyarbakır, TürkiyeSelçuk Üniversitesi, Veteriner Fakültesi, Doğum ve Jinekoloji Anabilim Dalı, Konya, Türkiye<b>Aim:</b> In this study, the effect of ovarian functions on estrus synchronization and pregnancy rates in Brown Swiss heifers and non-lactating cows synchronized with a modified ovsynch protocol was investigated.<p> <b>Materials and Methods:</b> The estrous cycle of heifers (n=60) and cows (n=27) was synchronized with two injections of 150 mcg d-cloprostenol (PGF<sub>2α</sub>) 14 days apart. Ovulation was induced with the injection of 50 mcg lesirelin acetate (GnRH) at 48 hour after the second PGF<sub>2α</sub>, and insemination (AI) was performed between 16-20 h following the last injection. Corpus luteum and follicle diameters were measured on days of PGF<sub>2α</sub> and GnRH injection with ultrasound. Moreover, blood samples were collected to assess plasma progesterone concentration on days of PGF<sub>2α</sub> injection and on AI day (day 0) and subsequently on 7, 14 and 21 days. Pregnancy was checked on day 28 after AI.<p> <b>Results:</b> Synchronization and pregnancy rates were found 87.4% and 36.8%, respectively. The most important factor reducing the efficacy of protocol during synchronization period was no luteal function in 6.89% of cows at time of the second PGF<sub>2α</sub> injection. The affecting negatively on pregnancy rates in synchronized cows was determined two main factors. 1- Lack of luteal function on day 7 post-insemination (11.84% of synchronized). 2- Possible early embryonic deaths (11.84% of synchronized).<p> <b>Conclusions:</b> It was concluded that the ovulation can be synchronized with modified ovsynch protocol, consisting of two PGF<sub>2α</sub> and one GnRH injection, and could be achieved to acceptable pregnancy rate in Brown Swiss heifers and non-lactating cows.http://eurasianjvetsci.org/pdf.php3?id=1030modified ovsynch protocolovarian functionestrus synchronizationpregnancy rate |
| spellingShingle | Mehmet Köse Tevfik Tekeli Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cows Eurasian Journal of Veterinary Sciences modified ovsynch protocol ovarian function estrus synchronization pregnancy rate |
| title | Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cows |
| title_full | Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cows |
| title_fullStr | Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cows |
| title_full_unstemmed | Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cows |
| title_short | Effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non-lactating cows |
| title_sort | effect of ovarian functions on estrus sychronization and pregnancy rate in brown swiss heifers and non lactating cows |
| topic | modified ovsynch protocol ovarian function estrus synchronization pregnancy rate |
| url | http://eurasianjvetsci.org/pdf.php3?id=1030 |
| work_keys_str_mv | AT mehmetkose effectofovarianfunctionsonestrussychronizationandpregnancyrateinbrownswissheifersandnonlactatingcows AT tevfiktekeli effectofovarianfunctionsonestrussychronizationandpregnancyrateinbrownswissheifersandnonlactatingcows |