Fertility in postpartum dairy cows in winter or summer following estrus synchronization and fixed time AI after the induction of an LH surge with GnRH or hCG

Rensis, F. De; Marconi, P; Capelli, T.; Gatti, Francesco G.; Facciolongo, F; Franzini, S.; Scaramuzzi, R. J.

doi:10.1016/s0093-691x(02)01075-0

Cited by 78 publications

(50 citation statements)

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“…Some researchers (DE RENSIS et al 2002, DE RENSIS andSCARAMUZZI 2003) reported that intensive relative humidity decreases oestrus expression and ovarian activity. In the present study, however, oestrus occurrence was not correlated with the relative humidity.…”

Section: Discussionmentioning

confidence: 99%

The effect of some seasonal conditions on oestrus occurrence in cows

Bülbül

Ataman

2009

Arch. Anim. Breed.

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In this study, the effect of climatic conditions on oestrus occurrence was investigated by using 9 972 oestrus records of cows recorded between 1995 and 2003. A distinct seasonal variation in the oestrus occurrence was determined. Oestrus occurrence observed in January, March, November and December was less than that in June and September (P<0.05). Annual distribution of the oestrus occurrence was positively correlated with environment temperature and insulation duration, but it was negatively correlated with rainfall (P<0.01). However, there was no relationship between oestrus occurrence and relative humidity. In addition to these, there was a slight decrease in the oestrus response when the temperature-humidity index (THI) was above 72; nevertheless, this decrease was not significant (P >0.05). The data presented in this study demonstrated that the increase in the environmental temperature up to 23 °C did not cause a suppressive effect on the ovarian activity. In conclusion, annual distribution of the oestrus occurrence is positively correlated with environment temperature and insulation duration whereas it is negatively correlated with rainfall in Holstein cows, in this study. Keywords: cattle, climatic conditions, oestrus response Zusammenfassung Einfluss der Jahreszeiten auf die Brunst bei KühenAn Hand von 9 927 Östrusdaten von Holsteinkühen aus den Jahren 1995 bis 2003 wurde der jahreszeitliche klimatische Einfluss auf das Brunstgeschehen bei Kühen untersucht. Grund war die Beobachtung einer saisonalen Veränderung des Östrusauftretens. So wurde ein geringeres Brunstauftreten in den Monaten Januar, März, November und Dezember gegenüber den Monaten Juni und September beobachtet. Die Datenanalyse ergab, dass signifikant das jahreszeitliche Östrusauftreten positiv mit der Umgebungstemperatur und der Sonnenscheindauer aber negativ mit der Niederschlagsmenge korreliert war. Keine Zusammenhänge fanden sich zwischen der relativen Luftfeuchtigkeit und dem Östrusgeschehen. Tendenziell wurde eine geringe Abnahme der Östren nachgewiesen, wenn der Wert des Temperatur-Feuchtigkeits-Indexes (THI) über 72 lag. Die Ergebnisse dieser Studie zeigen, dass Umgebungstemperaturen bis zu 23 °C die Ovarienaktivität nicht negativ beeinflussen. Zusammenfassend wird geschlussfolgert, dass bei dem vorliegenden Tiermaterial ein jahreszeitliches Östrusverhalten positiv mit BÜLBÜL and ATAMAN: The effect of some seasonal conditions on oestrus occurrence in cows 460 der Umwelttemperatur sowie der Sonnenscheindauer, jedoch negativ mit der Niederschlagsmenge korreliert ist.Schlüsselwörter: Kuh, Jahreszeit, Brunst

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Section: Discussionmentioning

confidence: 99%

The effect of some seasonal conditions on oestrus occurrence in cows

Bülbül

Ataman

2009

Arch. Anim. Breed.

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“…To synchronise and induce ovulation according to TAI protocol, hCG was used (3,19). It has been reported that hCG and GnRH have similar effects on the ovary (7); however, half life of hCG is longer than natural LH, and hCG works independently from the hypothalamo-hypophyseal axis (10).…”

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confidence: 99%

Efficacy of hCG and GnRH with Respect to Follicular Size and Presence of the Corpus Luteum in Cosynch Protocol Integrated with Norgestomet in Lactating Cows

Pancarcı

Lehimcioğlu

Ari

et al. 2013

Bulletin of the Veterinary Institute in Pulawy

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Efficacies of hCG and GnRH with respect to follicular diameter in Cosynch protocol were investigated. Lactating cows (n=119) received injections of GnRH and PGF 2 7 d apart. Norgestomet ear implant was inserted at GnRH administration and removed prior to PGF 2 injections. Presence of the corpus luteum (CL) at GnRH and PGF 2 injections, and diameter of preovulatory follicle [small (SPF) <8 mm or large (LPF) ≥8 mm] at PGF 2 were determined with transrectal ultrasonography (USG). The animals were randomly treated with GnRH (0.01 mg; GPG, n=62) or hCG (1,500 IU; GPH, n=57) at timed artificial insemination (TAI) 56 h after injection of PGF 2α . Pregnancies were diagnosed with USG 32-35 d after TAI. Pregnancies per TAI (P/TAI) were significantly (P<0.05) lower in GPH cows (28.1%; 16/57) compared to those in GPG animals (46.8%; 29/62). P/TAI with respect to follicular size did not differ between GPG and GPH cows, although P/TAI was numerically higher in LPF (30.0%; 15/50) than in SPF (14.3%; 1/7) in GPH cows. P/TAI in cows without CL at PGF 2 was 2.5 (1.0-6.7) times higher (P<0.01) in GPG (20.0%; 3/15) compared to GPH (10.5%; 2/19). In conclusion, use of hCG in milieu of the second GnRH in Cosynch+progesterone insert protocol did not have any advantage in lactating cows.

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“…On the contrary, in the summer season the conception rate was only 40.43 %. De Rensis et al (2002) confirmed that conception in cows is worse in summer season than in winter season. In their study, they documented that gravidity confirmed in 90 days reached 33 % in summer season against 46 % in winter season.…”

Section: Resultsmentioning

confidence: 67%

“…The heat stress is the main factor that contributes to low conception rates in dairy cows inseminated in the summer months (Al-Katanani et al, 1999). The decrease of conception in summer seasons can go down to 20 -30 % when compared to winter seasons (De Rensis et al, 2002). Low fertility is generally associated with warm months of the year, which are from June to September (De Rensis and Scaramuzzi, 2003).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ambient Temperature on Conception and Milk Performance in Breeding Holstein Cows

Klementová¹,

Filipčík²,

Hošek³

2017

Acta Univ. Agric. Silvic. Mendelianae Brun.

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The aim of this study was to identify the effect of ambient temperature and season of the year on conception difficulties in Holstein cattle. The experiment was conducted on the School farm in Žabčice. Data were collected from July 2016 to January 2017. Experimental population counted 263 breeding Holstein cows, which were inseminated during the observation period. Results of this study confirmed the effect of temperature and season on conception rates in dairy cows. In winter season, successful conception was recorded in 56.36 % of cows in average ambient temperature 1.48 °C, in summer season the conception rate was only 40.43 % in average daily temperature 18.96 °C. A more detailed analysis revealed the highest conception rates in the dairy cows in January (88.24 %) and February (91.67 %). On the contrary, the worst results were recorded in September (22.73 %) and October (28.57 %). Evaluation of conception rate according to ambient temperature intervals showed best results for the temperatures below 5 °C. A part of the study was also evaluation of an association between daily milk yield and conception rate. This hypothesis cannot be conclusively confirmed, because milk yield was mostly similar in both groups (pregnant and non-pregnant) on the days of insemination. The effect of lactation order and mean daily milk yield on the conception rate in cows was not confirmed.

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Fertility in postpartum dairy cows in winter or summer following estrus synchronization and fixed time AI after the induction of an LH surge with GnRH or hCG

Cited by 78 publications

References 46 publications

The effect of some seasonal conditions on oestrus occurrence in cows

The effect of some seasonal conditions on oestrus occurrence in cows

Efficacy of hCG and GnRH with Respect to Follicular Size and Presence of the Corpus Luteum in Cosynch Protocol Integrated with Norgestomet in Lactating Cows

The Effect of Ambient Temperature on Conception and Milk Performance in Breeding Holstein Cows

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