Physiological classification of anovulatory conditions in cattle

Wiltbank, Milo C.; Gümen, Ahmet; Sartori, Roberto

doi:10.1016/s0093-691x(01)00656-2

Cited by 282 publications

(205 citation statements)

References 108 publications

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“…Although cystic ovaries is considered a common and important economically reproductive disease of domestic animals, the mechanisms that leading to development of these cysts have been object of speculation and research for many years, but are not fully understood (Wiltbank et al 2003). Many studies have demonstrated changes and pathogenetic mechanisms evolved in follicular cyst in cattle (Garverick 1997, Isobe & Yoshimura 2007, Ortega et al 2007b, Monniaux et al 2008, Ortega et al 2008, Rey et al 2010), rat (Anderson & Lee 1997, Ortega et al 2007a, Salvetti et al 2009) and women (Abbot et al 2002, Ortega et al 2009b), but few investigations have been conducted in the genesis of this condition in sows.…”

Section: Discussionmentioning

confidence: 99%

Cytoskeletal proteins in the follicular wall of normal andcystic ovaries of sows

et al. 2015

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The expression of cytoskeletal proteins was evaluated immunohistochemically in 36 normal ovaries sampled from 18 sows and 44 cystic ovaries sampled from of 22 sows, was evaluated. All sows had history of reproductive problems, such as infertility or subfertility. The immunohistochemically stained area (IHCSA) was quantified through image analysis to evaluate the expression of these proteins in the follicular wall of secondary, tertiary, and cystic follicles. Cytokeratins (CK) immunoreactivity was strong in the granulosa cell layer (GC) and mild in the theca interna (TI) and externa (TE) of the normal follicles. There was severe reduction of the reaction to CK in the GC in the cystic follicles, mainly in the luteinized cysts. The immunoreactivity for vimentin was higher in the GC from normal and cystic follicles in contrast with the other follicular structures. In the luteinized cysts, the IHCSA for vimentin was significantly higher in TI and in both observed cysts, the labeling was more accentuated in TE. Immunohistochemical detection of desmin and α-SMA was restricted to the TE, without differences between the normal and cystic follicles. The results of the current study show that the development of ovarian cysts in sows is associated to changes in the expression of the cytoskeletal proteins CK and vimentin.

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Section: Discussionmentioning

confidence: 99%

Cytoskeletal proteins in the follicular wall of normal andcystic ovaries of sows

et al. 2015

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“…O grau de balanço energético negativo (BEN) em que o animal se encontra é um fator que pode influenciar o intervalo entre o tratamento com progesterona + estradiol e o início da nova onda folicular. Imakawa et al (1987) constataram que, em novilhas ovariectomizadas que apresentavam perdas de peso e de CC, o eixo hipotálamo-hipofise tornase hipersensível ao feed back negativo do estradiol sobre a secreção de GnRH, o que influencia negativamente a secreção de LH e FSH (Wiltbank et al, 2002). Esses autores sugeriram que, em vacas em BEN pós-parto, o estradiol pode atuar como na pré-puberdade, inibindo a secreção de GnRH no hipotálamo (Schillo, 1992).…”

Section: Discussionunclassified

“…Relatos da década de 70 revelaram que vacas primíparas apresentam período de anestro mais longo (20 a 30 dias) do que vacas multíparas (Wiltbank, 1970;Mossman e Hanly, 1977). Desde então, em fazendas que usam estação de monta (EM), com monta natural ou programas de IA convencional, é prática comum iniciar a EM de novilhas antes do restante do rebanho, a fim de que no ano seguinte, após o primeiro parto, elas disponham de maior período para se recuperar do anestro pós-parto antes do início da estação de monta.…”

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Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

Meneghetti

Vasconcelos

2008

Arq. Bras. Med. Vet. Zootec.

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RESUMONo experimento I, foi avaliada a alteração da condição corporal (CC) pré e pós-parto em 155 novilhas inseminadas para parir de setembro a dezembro. A CC foi avaliada mensalmente no pré e pós-parto, de junho a fevereiro. No experimento II, 538 vacas primíparas foram sincronizadas com o protocolo de inseminação artificial em tempo fixo (IATF) que usou estradiol junto ao dispositivo intravaginal de progesterona (CIDR ® ). As taxas de ciclicidade, sincronização e concepção foram avaliadas por ultra-som. No experimento I, os animais que pariram primeiro tiveram maior (P<0,001) redução na CC pós-parto. No experimento II, foi observado maior CC (P<0,0001) nos animais com menor número de dias pós-parto, maior (P<0,05) taxa de sincronização nas vacas de melhor CC e aumento (P<0,0001) na taxa de concepção proporcional ao aumento na CC (incremento médio na concepção de seis pontos percentuais para cada 0,25 ponto na CC). Não se deve antecipar a parição de novilhas de corte quando se pretende realizar IATF no início da estação de monta subseqüente.Palavras-chave: gado de corte, primípara, condição corporal, inseminação artificial em tempo fixo atrasar a concepção e/ou levar ao descarte por falha reprodutiva. Estudos mostram que a condição nutricional pré e pós-parto influencia a duração do período de anestro (Richards et al., 1986;Ruas et al., 2005). ABSTRACT In experiment I, it was evaluated the body condition score (BCS) change during pre and post-partum in 155 heifers, inseminated to calve from September to December. The BCS was monthly evaluated from June to February, during the pre and post-partum periods. In experiment II, 538 primiparous cows were synchronized with a timed artificial insemination (TAI) protocol which used estradiol associated with an intravaginal progesterone device (CIDR ®)

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“…Both conditions have complicated endocrinological backgrounds, reviewed by Wiltbank et al (2002). Cows not observed in oestrus by the herdsman are generally subjected to a clinical examination and treatment by a veterinarian, but often too late to get an economically optimal calving interval.…”

Section: Introductionmentioning

confidence: 99%

Detection of delayed cyclicity in dairy cows based on progesterone content in monthly milk samples

Petersson

Strandberg

Gustafsson

et al. 2008

Preventive Veterinary Medicine

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We examined whether infrequent milk sampling for progesterone analysis could be used as a management or diagnostic tool by the dairy farmer to predict delayed ovarian cyclicity in dairy cows. The data included 1040 lactations from 324 Swedish Red cows and 183 Swedish Holstein cows and were randomly divided into two datasets. A logistic regression model was fit to the first dataset and the model was then validated on the other dataset. The model was also validated using a British dataset comprising 1212 lactations from 1080 British Holstein-Friesian cows. The dependent variable was whether delayed ovarian cyclicity occurred or not, delayed ovarian cyclicity defined as progesterone levels below threshold value for the first 56 or 45 days postpartum in the Swedish or British dataset, respectively. The basic model included the effects of breed, parity, season and housing type. To the basic model various progesterone-based measurements were added. These were the interval from calving to commencement of luteal activity and the percentage of samples with luteal activity within 60 days after calving, using all samples in the databases or one sample per month. The accuracy of the conditional probability of delayed ovarian cyclicity calculated with the different models was obtained using receiver operating characteristic (ROC) curves and calculating the area under curve. Sensitivity and specificity were calculated for cut-off probabilities using the ROC analyses. The accuracy was highest (0.94-0.99) when including the progesterone measurements based on milk sampling for progesterone analysis 2-3 times per week. The accuracy was between 0.85 and 0.88 when the progesterone measurements with monthly milk sampling were added to the model and 0.76 or 0.67 with the basic model. This study clearly shows that infrequent milk sampling for progesterone analysis, such as once a month as in the regular milk recording system, could be used to predict delayed ovarian cyclicity in dairy cows. This increases the opportunity for earlier treatment of anovulatory dairy cows and may therefore decrease involuntarily extended calving intervals in the herd.

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Physiological classification of anovulatory conditions in cattle

Cited by 282 publications

References 108 publications

Cytoskeletal proteins in the follicular wall of normal andcystic ovaries of sows

Cytoskeletal proteins in the follicular wall of normal andcystic ovaries of sows

Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

Detection of delayed cyclicity in dairy cows based on progesterone content in monthly milk samples

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