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 11 publications

(6 citation statements)

References 78 publications

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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).…”

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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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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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“…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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“…High concentrations of estradiol in the culture medium increase the number of male embryos (Chang et al, 2022;Zhang et al, 2008). Cows with high estradiol concentrations have also been found to have a higher ratio of male calves (Emadi et al, 2014). The sex ratio may also be in uenced by the likelihood of X and Y sperm reaching the oviduct (Gharagozlou et al, 2016).…”

Section: Progesterone Levels Parametersmentioning

confidence: 99%

The initial study on the benefits of flushing with Lemuru fish oil as a source of DHA and EPA on the performance of reproductive parameters in Garut ewes

Nurlatifah,

Herdis,

Arifiantini

et al. 2023

Preprint

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This study aimed to evaluate and analyze the effects of a flushing diet containing DHA and EPA from Lemuru fish oil on the reproductive performance parameters of Garut ewes. Forty (n = 40) primiparous Garut ewes aged 12–14 months with a body weight of 28.92 ± 4.94 kg were assigned into four experimental treatment groups. The experimental diets contained roughage : concentrate (30:70%) designated as control concentrate (CNT), flushing concentrate with 6% palm oil (PO), flushing concentrate with 3% palm oil mixed with 3% lemuru oil as DHA and EPA sources (PFO), and flushing concentrate with the addition of 6% lemuru oil (FO). Treatment animals were fed two weeks before and after conception and parturition (8 weeks of total flushing treatment). The addition of fish oil at either 3% (PFO) or 6% (FO) resulted in significantly higher reproductive performance of ewes by increasing the litter size, as reflected by the birth of multiple kids (P < 0.05) compared to CNT and PO. Adding fish oil (PFO and FO) also maintains gestation, resulting in increased kid yield, especially in the FO treatment, which yields the highest kid yield (0% single kid birth). The male ration lamb was also higher with fish oil supplementation (PFO and PO) (P < 0.05). Supplementation with fish oil could also maintain progesterone levels during the gestation period and some biochemical blood parameters. This study showed that using Lemuru fish oil 6% (FO) with a concentration of 1.34% DHA and EPA overall led to significantly higher reproductive performance in Garut sheep.

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

Cited by 11 publications

References 78 publications

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

The initial study on the benefits of flushing with Lemuru fish oil as a source of DHA and EPA on the performance of reproductive parameters in Garut ewes

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