Relationship of plasma estradiol-17β, total estrogen, and progesterone to estrus behavior in mithun (Bos frontalis) cows

Mondal, Mohan; Rajkhowa, C.; Prakash, B.S.

doi:10.1016/j.yhbeh.2005.12.015

Cited by 47 publications

(34 citation statements)

References 36 publications

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“…However, a significant correlation was detected between E 2 concentrations in plasma and E 2 concentrations or E 2 content in follicles. The concentration of E 2 in plasma has been positively correlated with estrus duration and behavior in cattle (Mondal et al 2006, Wiltbank et al 2006. Pregnancy rates were related to the diameter of the preovulatory follicles and E 2 concentration in plasma in dairy cows (Lopes et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Dietary unsaturated fatty acids influence preovulatory follicle characteristics in dairy cows

Zachut

Arieli²,

Lehrer³

et al. 2008

Reproduction

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Dietary unsaturated fatty acids (UFAs) have been implicated in several reproductive processes in dairy cows through a variety of mechanisms. This study examined the effects of periparturient supplementation of rumen bypass fats low or high in proportion of UFAs (oleic and linoleic) on preovulatory follicle characteristics. Forty-two 256-day pregnant dairy cows were divided into three groups and were fed a control diet (nZ14) or supplemented with fats either low (LUFA; nZ14) or high (HUFA; nZ14) in UFAs. At 14-15 days following behavior estrus, the cows received a prostaglandin F 2a injection and 48 h later O7 mm follicles were aspirated. Progesterone (P 4 ), androstenedione (A 4 ), and estradiol (E 2 ) were determined in the follicular fluid. Out of 75 follicles, 37 follicles that were aspirated between 55 and 70 days post partum were regarded as E 2 -active follicles (E 2 /P 4 ratio O1) and subjected for further analysis. The diameter of preovulatory follicles was greater in cows fed HUFA than in those fed control or LUFA. The concentrations and content of A 4 and E 2 in follicles and E 2 /P 4 ratio were higher in the HUFA group than in the other two groups. The P450 aromatase mRNA expression in granulosa cells that were collected from the aspirated preovulatory follicles was also higher in the HUFA cows than in the other groups. A significant correlation was observed between E 2 concentrations in preovulatory follicles and E 2 concentrations in plasma at aspiration. In conclusion, dietary UFA increased the size of and elevated steroid hormones in preovulatory follicles, which may be beneficial to consequent ovarian function.

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Section: Discussionmentioning

confidence: 99%

Dietary unsaturated fatty acids influence preovulatory follicle characteristics in dairy cows

Zachut

Arieli²,

Lehrer³

et al. 2008

Reproduction

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“…A reduction in feed intake could mostly be caused by estrogens (Uphouse and Maswood, 1998). Mondal et al (2006) reported increasing quantities of estradiol-17β 6 days before estrus that reached peak level on the day of estrus and declined to basal level on day 3 of the estrous cycle. In the current study, day 1 may be characterized by the time of ovulation.…”

Section: Discussionmentioning

confidence: 99%

Influence of estrus on dry matter intake, water intake and BW of dairy cows

Reith

Pries²,

Verhülsdonk³

et al. 2014

Animal

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The objectives of this study were to analyze whether dry matter intake (DMI), water intake (WI) and BW were influenced by estrus. A second objective was to determine whether correlations exist among these traits in non-estrous days. Data collection included 34 Holstein-Friesian cows from the research farm 'Haus Riswick' of the Agricultural Chamber North Rhine-Westphalia, Germany. On an individual basis, daily DMI and daily WI were measured automatically by a scale in the feeding trough and a WI monitoring system, respectively. BW was determined by a walk-through scale fitted with two gates -one in front and one behind the scale floor. Data were analyzed around cow's estrus with day 0 (the day of artificial insemination leading to conception). Means during the reference period, defined as days − 3 to − 1 and 1 to 3, were compared with the means during estrus (day 0). DMI, WI and BW were affected by estrus. Of all cows, 85.3% and 66.7% had reduced DMI and WI, respectively, on day 0 compared with the reference period. Lower BW was detected in 69.2% of all cows relative to the reference period. During the reference period, average DMI, WI and BW were 23.0, 86.6 and 654.8 kg. A minimum DMI of 20.4 kg and a minimum BW of 644.2 kg were detected on the day of estrus, whereas the minimum WI occurred on the day before estrus. After estrus, DMI, WI and BW returned to baseline values. Intake of concentrated feed did not seem to be influenced by estrus. Positive correlations existed between daily DMI and daily WI (r = 0.63) as well as between cows' daily BW and daily WI (r = 0.23). The results warrant further investigations to determine whether monitoring of DMI, WI and BW may assist in predicting estrus.

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“…These authors write: 'further, studies are needed to evaluate to what degree maternal hormone levels are related to oestrus duration and sex ratio'. Mondal et al (2006) reported that oestrus behaviour correlates positively with oestrogen levels in cows. The author suggests that the variation of offspring sex ratio with duration of oestrus is secondary to correlations of both with oestrogen levels.…”

Section: Rosenfeldmentioning

confidence: 99%

Evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels around the time of conception

James

2007

Journal of Endocrinology

141

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Relationship of plasma estradiol-17β, total estrogen, and progesterone to estrus behavior in mithun (Bos frontalis) cows

Cited by 47 publications

References 36 publications

Dietary unsaturated fatty acids influence preovulatory follicle characteristics in dairy cows

Dietary unsaturated fatty acids influence preovulatory follicle characteristics in dairy cows

Influence of estrus on dry matter intake, water intake and BW of dairy cows

Evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels around the time of conception

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