Administration of estradiol benzoate before insemination could skew secondary sex ratio toward males in Holstein dairy cows

Emadi, S R; Rezaei, Abdolreza Sheikh; Bolourchi, M.; Hovareshti, P.; Akbarinejad, Vahid

doi:10.1016/j.domaniend.2014.03.001

Cited by 15 publications

(7 citation statements)

References 78 publications

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“…The lower OR for pregnancy in multiparous cows compared to primiparous cows was reported in many previous studies (2,18,41,47). We found a significant interaction between cow parity and synchronization protocols; multiparous cows showed a significantly lower OR for pregnancy compared with primiparous cows using PG+EB protocol, which was consistent with a recent study (14). Another study additionally supported our results where primiparous cows who received estradiol had higher pregnancy rates than multiparous cows who received estradiol (49).…”

Section: Discussionsupporting

confidence: 92%

Risk Factors for the Probability of Pregnancy Following Synchronization Protocols in Dairy Cows

Jeong¹,

Kang²,

Jung³

et al. 2014

J Vet Clin

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The objective of this study was to determine the risk factors associated with pregnancy following 3 synchronization protocols in dairy cows. Data were collected on 1,952 cows from 22 dairy farms, including synchronization protocols (PGF 2α + estradiol benzoate [PG+EB], Ovsynch, and CIDR-ovsynch), cow parity, body condition score (BCS), and dates of previous calving, insemination and conception. The odds ratio (OR) for pregnancy were analyzed by logistic regression using the LOGISTIC procedure in SAS. The analysis revealed that farm (p = 0.005), cow parity (p = 0.0001), BCS (p < 0.005), and AI season (p < 0.05) significantly affected and calving to AI interval tended to affect (p < 0.1) the probability for pregnancy. Although synchronization protocols did not affect the probability for pregnancy (p > 0.05), cow parity and synchronization protocols showed a significant interaction (p < 0.005); the OR (0.60) was significantly lower (p < 0.0001) for multiparous cows compared to primiparous cows using PG+EB, whereas the OR (1.44) tended to be higher (p < 0.1) for multiparous cows compared to primiparous cows using the Ovsynch, and the probability for pregnancy did not differ between multiparous and primiparous cows using the CIDRovsynch (p > 0.05). Cows with BCS ≥ 3.00 were more likely pregnant (OR: 1.41) compared with cows having BCS ≤ 2.75, whereas cows inseminated during summer had a lower OR (0.73) compared with those inseminated during spring. Cows with a calving to AI interval > 150 days were more likely to be pregnant (OR: 1.20) compared with cows with a calving to AI interval ≤ 150 days. In conclusion, the OR for pregnancy following synchronization protocols in dairy cows was affected by farm, parity, BCS, calving to AI interval of the cow, and AI season, and there was a significant interaction between cow parity and synchronization protocols; the OR for pregnancy was lower for multiparous cows compared with primiparous cows using the PG+EB protocol.

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Section: Discussionsupporting

confidence: 92%

Risk Factors for the Probability of Pregnancy Following Synchronization Protocols in Dairy Cows

Jeong¹,

Kang²,

Jung³

et al. 2014

J Vet Clin

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“…At least in part, reduced circulating concentrations of steroids reflects increased liver metabolism during lactation (Wiltbank et al 2006). Administration of estradiol cypionate around the time of ovulation has been reported to increase pregnancy rate (Cerri et al 2004;Emadi et al 2014). In contrast, benefits of supplementation of cows with progesterone after insemination are small (Wiltbank et al 2014).…”

mentioning

confidence: 99%

Use of single nucleotide polymorphisms in candidate genes associated with daughter pregnancy rate for prediction of genetic merit for reproduction in Holstein cows

et al. 2016

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We evaluated 69 SNPs in genes previously related to fertility and production traits for their relationship to daughter pregnancy rate (DPR), cow conception rate (CCR) and heifer conception rate (HCR) in a separate population of Holstein cows grouped according to their predicted transmitting ability (PTA) [≤-1 (n = 1287) and ≥1.5 (n = 1036)] for DPR. Genotyping was performed using Sequenom MassARRAY(®) . There were a total of 39 SNPs associated with the three fertility traits. The SNPs that explained the greater proportion of the genetic variation for DPR were COQ9 (3.2%), EPAS1 (1.0%), CAST (1.0%), C7H19orf60 (1.0%) and MRPL48 (1.0%); for CCR were GOLGA4 (2.4%), COQ9 (1.8%), EPAS1 (1.1%) and MRPL48 (0.8%); and for HCR were HSD17B7 (1.0%), AP3B1 (0.8%), HSD17B12 (0.7%) and CACNA1D (0.6%). Inclusion of 39 SNPs previously associated with DPR in the genetic evaluation system increased the reliability of PTA for DPR by 0.20%. Many of the genes represented by SNPs associated with fertility are involved in steroidogenesis or are regulated by steroids. A large proportion of SNPs previously associated with genetic merit for fertility in Holstein bulls maintained their association in a separate population of cows. The inclusion of these genes in genetic evaluation can improve reliabilities of genomic estimates for fertility.

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“…It is difficult to compare the results of this study with those of similar studies due to the general lack of the data presenting the effect of cGnRH on sex ratio in avian species. Nevertheless, a relationship between hormone and secondary sex ratio has been reported in Holstein dairy cows (Emadi et al, 2014). It is physiologically accepted that the amount of estradiol produced in domestic mammals is relative to the amount of GnRH reaching the pituitary gland.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, a cow's phenotypic response to estradiol may in turn be related to its response to GnRH. According to Emadi et al (2014), estradiol benzoate administration increased the likelihood of calves being male. When day length shortens, melatonin secretion in domestic mammal increases and this increase is accompanied by an increase in GnRH secretion.…”

Section: Discussionmentioning

confidence: 99%

Effects of the injection of chicken gonadotropin-releasing hormone-ı on egg fertility and hatching traits

Çiftçi

2022

Tavukçuluk Araştırma Dergisi

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The aim of this study was to measure the effect of chicken GnRH-I injection of roosters on egg fertility, hatching traits, and performance in layer breeder. Sixteen male and 160 female breeder chickens were divided into four experimental groups. Each group is consisting of 4 males and 40 females with four replications. Comprising a control group, a negative control group (received 200 µl phosphate-buffered saline, PBS), a low hormone group (received 200 µl PBS + 10 µg cGnRH-I) and a high hormone group (received 200 µl PBS + 50 µg cGnRH-I). Injection of 50 µg cGnRH significantly increased the fertility percentage of laid eggs over control, PBS and low hormone injected groups after period I. Injection of either 10 or 50 µg cGnRH significantly increased the relative fertility percentages of eggs following period IV. Injection of 50 µg cGnRH induced a significant increase in the hatchability of set eggs and the hatchability of fertile eggs after periods I and II. Further research is needed to measure the impact of cGnRH on fertility and hatching rates by injecting both male and female of same breed and age with the same doses.

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Administration of estradiol benzoate before insemination could skew secondary sex ratio toward males in Holstein dairy cows

Cited by 15 publications

References 78 publications

Risk Factors for the Probability of Pregnancy Following Synchronization Protocols in Dairy Cows

Risk Factors for the Probability of Pregnancy Following Synchronization Protocols in Dairy Cows

Use of single nucleotide polymorphisms in candidate genes associated with daughter pregnancy rate for prediction of genetic merit for reproduction in Holstein cows

Effects of the injection of chicken gonadotropin-releasing hormone-ı on egg fertility and hatching traits

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