Neuroendocrine Control of Estrus and Ovulation

Amstalden, M.; Williams, Gary L.

doi:10.1002/9781118833971.ch23

Cited by 6 publications

(4 citation statements)

References 182 publications

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“…Oestrus in beef heifers can be characterized by behavioural and physiological signs along with hormonal concentrations. In the light of the intricate hormonal regulation of the oestrous cycle, progesterone level is considered to be a practical determinant of the oestrous cycle stage in the bovine (Amstalden & Williams, ). Based on the signs of oestrous and the blood plasma progesterone concentrations (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…The non‐oestrous sample used for blood plasma metabolite profile comparison was selected from the productive performance sampling within 12 ± 8 days (mean ± SD ) of the oestrus day for each heifer. The approximate 21‐day duration of the bovine oestrous cycle (Amstalden & Williams, ) was considered to ensure that the performance sample was a non‐oestrous sample.…”

Section: Methodsmentioning

confidence: 99%

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Metabolic blood profile of beef heifers during oestrous and non‐oestrous states

Crane

Munro

Bourgon

et al. 2016

Reprod Domestic Animals

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Haematological metabolic profiles in heifers could contribute to the development of proxies for oestrous detection and provide clues to further characterize biological changes during oestrus. One hundred and seven beef heifers were observed for oestrous behaviour twice daily for 124 days. Feed intake and productive performance (body weight and composition) traits were measured, and feed efficiency was determined using residual feed intake (kg DM/day). Blood plasma samples were collected when signs of oestrus were observed and every 30 ± 2 days. Heifers were considered in oestrus (n = 71) when plasma progesterone concentrations were <0.6 ng/ml. Least square means of blood metabolic parameters were compared between oestrous and non-oestrous states and within oestrous groups according to performance traits and age. Heifers in oestrus exhibited higher concentrations of alkaline phosphatase, aspartate aminotransferase (AST), beta-hydroxybutyric acid, creatine kinase (CK) and triiodothyronine (T3) than heifers in non-oestrus. Heifers in oestrus revealed lower osmolality and concentrations of calcium, sodium and total protein than during non-oestrus. Younger (and smaller) heifers had greater concentrations of CK, gamma-glutamyl transferase (GGT), glucose and sodium than the older heifers. Heifers with lower fatness had increased osmolality and concentrations of cholesterol, CK, phosphorus, sodium and reduced T3 levels. Feed efficient heifers had greater levels of AST, cholesterol and GGT than inefficient heifers. Blood plasma parameters may be complementary to oestrous detection upon further validation; effects of age, feed efficiency, body size and body composition should be considered to optimize this haematological assessment.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Metabolic blood profile of beef heifers during oestrous and non‐oestrous states

Crane

Munro

Bourgon

et al. 2016

Reprod Domestic Animals

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“…In Brahman heifers, it was found to be involved in the regulation of insulin and glucose levels, which are very important for cell metabolism and proper communication of the endocrine axis, resulting in carrier females achieving oocyte development and quality leading to first ovulation and puberty faster than non-carriers (Amstalden and Williams, 2014). In sheep and goats, CLSTN2 has been identified as a potential candidate gene for fertility and can be used for marker-assisted selection (Wijayanti et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Fec, CA5A and CLSTN2 genes and their function during sheep ovulation: a review.

Delgado-Tiburcio

Cortez‐Romero

Martínez

et al. 2023

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Objective: To describe the function of Fec, CA5A and CLSTN2 genes during ovulation in ewes. Design/methodology/approach: A search and analysis of scientific information related to Fec, CA5A and CLSTN2 genes in sheep was performed. Results: Fec, CA5A and CLSTN2 genes are involved at the ovarian level; ewes carrying the first gene were found to have increased ovulation rate, folliculogenesis and granulosa cell differentiation. CA5A stimulates an increased follicular rate and plays an important role in pre-implantation. While CLSTN2 has activity in ovarian development and growth; it also has the ability to interact with other genes involved in follicular maturation, granulosa cell differentiation and development of the ovarian follicle. Limitations on study/implications: Ewes carrying these genes increase the prolificacy rate in the flock. Findings/conclusions: The expression of these genes acts synergistically in the ovulatory process, enhancing the ovulatory response by contributing to endocrine, paracrine and molecular synchronisation, so that the maturation of the oocyte occurs, leading to ovulation.

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“…Starting with puberty and then cyclically repeated along productive life, the reproductive process in females requires the release of the gonadotropin-releasing hormone (GnRH) from the hypothalamus, which in turn is needed for the secretion of gonadotropins from the anterior pituitary gland (Amstalden and Williams, 2015;Atkins et al, 2013). Research devoted to understanding the mechanisms underlying the onset of puberty and the regulation of subsequent reproductive cycles in different mammal species contributed to building the "KNDy hypothesis" (Smith et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

FIRST KARYOTYPE REPORT ON Colocasia oresbia: A COMPARATIVE CYTOGENETIC STUDY BETWEEN TWO VARIETIES

Kazi

Chandan

Syeda

2020

BAG

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Karyotypes of two Colocasia oresbia botanical varieties from Bangladesh were analyzed and compared with orcein, chromomycin A3 (CMA) and 4´-6 diamidino-2-phenylindole (DAPI). Both varieties had 2n=2x=26 chromosomes (karyotypic formula: 20m+6sm) and a pair of satellites each. Total chromosome length was 144.18±2.45 μm in C. oresbia var. oresbia and 133.02±2.75 μm in C. oresbia var. stolonifera. The karyotype of Colocasia oresbia var. oresbia is 2A whereas that of C. oresbia var. stolonifera is 1A. Six CMA and four DAPI bands were observed in C. oresbia var. oresbia and eight CMA and six DAPI bands in C. oresbia var. stolonifera. However, in these two morphologically distinct C. oresbia varieties of two different ecological zones, the same somatic chromosome number, diversification in various karyotypic parameters and CMA/DAPI-banding patterns were observed. In addition to taxonomic characters, the studied karyotype features will contribute to the characterization of these two C. oresbia varieties and to establish a base for future research. Key words: chromosome banding; CMA; DAPI; Karyotype.

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Neuroendocrine Control of Estrus and Ovulation

Cited by 6 publications

References 182 publications

Metabolic blood profile of beef heifers during oestrous and non‐oestrous states

Metabolic blood profile of beef heifers during oestrous and non‐oestrous states

Fec, CA5A and CLSTN2 genes and their function during sheep ovulation: a review.

FIRST KARYOTYPE REPORT ON Colocasia oresbia: A COMPARATIVE CYTOGENETIC STUDY BETWEEN TWO VARIETIES

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