Occurrence of cystic ovaries in dairy cows in Sweden

Emanuelson, Ulf; Bendixen, P.H.

doi:10.1016/0167-5877(91)90012-q

Cited by 14 publications

(13 citation statements)

References 17 publications

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“…Furthermore, the 305 day milk yield equivalent in the previous lactation was not significantly different between the cystic and the non-cystic cows, suggesting a non-causal association. This finding is in agreement with some previous reports [16,17], but not in accord with the results of other studies [12][13][14]. It was reported that cystic lactations produced more milk than non-cystic lactations [12,14].…”

Section: Discussionsupporting

confidence: 83%

“…The most widely accepted hypothesis is that it is a early lactation stress, twin calving, breed and is thought to be hereditary [12,13]. It is widely thought that high milk production increases the risk of a cow to develop COD [12][13][14]. Many authors also agree that lactations from cows that have COD produce a greater 305 day milk yield than non cystic lactations [12][13][14][15].…”

mentioning

confidence: 97%

“…It is widely thought that high milk production increases the risk of a cow to develop COD [12][13][14]. Many authors also agree that lactations from cows that have COD produce a greater 305 day milk yield than non cystic lactations [12][13][14][15]. However some authors argue that high milk production is not the cause of COD [16,17].…”

mentioning

confidence: 99%

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confidence: 99%

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Risk Factors of Cystic Ovarian Disease in Dairy Cattle.

Zulu

Penny

1998

Journal of Reproduction and Development

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Abstract. Production and reproduction records of the Holstein dairy herd at Edinburgh University's Langhill farm were analyzed to study the incidence, possible risk factors and to assess the reproductive performance of cows with cystic ovaries. Risk factors investigated were whether a cow was from the genetically selected or control herd, 305 day milk yield equivalent of the previous lactation to the cystic one, and age/parity. For analysis of the consequences of cystic ovarian disease, cystic cows were individually matched to non-cystic herd mates for selection or control herd, age/parity, and month of calving. The cumulative lactational incidence of cystic ovarian disease was 8.1%. Selected herd cows were more at risk of developing cystic ovarian disease than control herd cows (p<0.05) and odds ratio 3.55. There was no significant association between high milk production in the previous lactation and COD (p<0.05). However, a significant association between increasing age/parity and cystic ovarian disease was found (p<0.01). The 305 day milk yield equivalent in the previous and cystic lactation for the cystic cows was not significantly different from the paired herd mates (p>0.05) respectively. However, the cystic cows produced significantly higher 305 day milk yield equivalent in the cystic lactation than the previous non-cystic lactation (p<0.001). The calving to conception and calving intervals were significantly longer in the cystic cows than the non-cystic paired cows (p<0.05) respectively. In conclusion, cystic ovarian disease causes an increase in the calving to conception and calving intervals. COD is common in older cattle. To understand risk factors more research needs to be done, especially high milk production prior to cystic ovarian disease diagnosis in the same lactation.

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Section: Discussionsupporting

confidence: 83%

mentioning

confidence: 97%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Risk Factors of Cystic Ovarian Disease in Dairy Cattle.

Zulu

Penny

1998

Journal of Reproduction and Development

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“…However, suprabasal progesterone profiles seem to play a limited role in primary COF formation [69]. Factors indirectly reducing GnRH/LH secretion like stress [6,[70][71][72], intrauterine infections [44,73] and seasonality [74] are also considered to increase the risk of cyst formation.…”

Section: Hypothalamic-pituitary Dysfunctionmentioning

confidence: 99%

Aetiology and pathogenesis of cystic ovarian follicles in dairy cattle: a review

2006

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-Cystic ovarian follicles (COF) are an important ovarian dysfunction and a major cause of reproductive failure in dairy cattle. Due to the complexity of the disorder and the heterogeneity of the clinical signs, a clear definition is lacking. A follicle becomes cystic when it fails to ovulate and persists on the ovary. Despite an abundance of literature on the subject, the exact pathogenesis of COF is unclear. It is generally accepted that disruption of the hypothalamo-pituitary-gonadal axis, by endogenous and/or exogenous factors, causes cyst formation. Secretion of GnRH/LH from the hypothalamus-pituitary is aberrant, which is attributed to insensitivity of the hypothalamus-pituitary to the positive feedback effect of oestrogens. In addition, several factors can influence GnRH/LH release at the hypothalamo-pituitary level. At the ovarian level, cellular and molecular changes in the growing follicle may contribute to anovulation and cyst formation, but studying follicular changes prior to cyst formation remains extremely difficult. Differences in receptor expression between COF and dominant follicles may be an indication of the pathways involved in cyst formation. The genotypic and phenotypic link of COF with milk yield may be attributed to negative energy balance and the associated metabolic and hormonal adaptations. Altered metabolite and hormone concentrations may influence follicle growth and cyst development, both at the level of the hypothalamus-pituitary and the ovarian level.cystic ovarian follicles / pathogenesis / hypothalamus-pituitary / ovary / negative energy balance

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Cystic Ovarian Follicles

Smith

2014

Bovine Reproduction

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Occurrence of cystic ovaries in dairy cows in Sweden

Cited by 14 publications

References 17 publications

Risk Factors of Cystic Ovarian Disease in Dairy Cattle.

Risk Factors of Cystic Ovarian Disease in Dairy Cattle.

Aetiology and pathogenesis of cystic ovarian follicles in dairy cattle: a review

Cystic Ovarian Follicles

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