Comparison of accuracy of transabdominal ultrasonography, progesterone and pregnancy-associated glycoproteins tests for discrimination between single and multiple pregnancy in sheep

Karen, Aly; Amiri, Bassir; Beckers, J. F.; Sulon, J.; Taverne, M.A.M.; Szenci, O.

doi:10.1016/j.theriogenology.2005.11.017

Cited by 33 publications

(24 citation statements)

References 23 publications

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“…Exposing biases in the hunted sample is not a reason to abandon the discrete time model, but on the contrary, it provides an opportunity to refine its use, especially with the use of non-invasive reproductive assessment techniques (Karen et al, 2006). The model can only be used safely when such biases have been weeded out, or at least their impact measured.…”

Section: Resultsmentioning

confidence: 99%

“…The result is that there is usually a large amount of information available about female fertility after a large cull. Furthermore, ultrasonography and hormonal levels have been used as non-invasive reproductive assessment techniques for pregnancy diagnosis and accurate prediction of conception date (Gonzalez et al, 2004;Karen et al, 2006). Therefore, in this paper we seek to develop a general method that can be used simply to predict birth probabilities from mammalian fertility data.…”

Section: Introductionmentioning

confidence: 99%

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A model to search for birth probabilities of mammal populations using fertility data

et al. 2009

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A model was constructed to predict monthly birth probabilities using mammalian fertility data. We used a sample of 147 female capybaras (Hydrochoerus hydrochaeris) hunted on a farm on Marajó Island, Brazil. In the model each month was treated as a multinomial with six cells representing the six possible reproductive states (five months gestation). A hypothesis test was carried out to see whether a cosine curve would fit the birth probabilities. The results offer no support for a seasonal component (F 2,9 = 1.84, P = 0.21), whereas results from a direct census do (F 3,23 = 87.29, P < 0.01). Some hunting techniques were biased towards killing pregnant females (χ 2 1 = 7.2, P< 0.01), thereby spreading reproduction throughout the year (F 2,9 = 1.84, P = 0.21). The model remained a powerful predictive tool to be used with mammalian fertility data as long as the data are not biased towards pregnant females.Keywords: capybara, Hydrochoerus hydrochaeris, model, breeding season, fertility. Um modelo para busca por probabilidades de nascimentos de populações de mamíferos utilizando dados de fertilidade ResumoUm modelo foi desenvolvido para predizer as probabilidades de nascimentos mensais utilizando dados de fertilidade de mamíferos. Utilizamos uma amostra de 147 fêmeas de capivaras (Hydrochoerus hydrochaeris) caçadas em fazenda da Ilha de Marajó, Brasil. Cada mês foi tratado no modelo como um multinômio com seis células representando os seis possíveis estados reprodutivos (cinco meses de gestação). Um teste de hipótese foi realizado para avaliar se uma curva cossena se ajustava às probabilidades de nascimentos. Os resultados não apoiaram um componente sazonal (F 2,9 = 1,84, P = 0,21), enquanto houve apoio por parte dos resultados de censo direto (F 3,23 = 87,29, P < 0,01). Algumas técnicas de abate eram tendenciosas ao abate de fêmeas prenhas (χ 2 1 = 7,2, P < 0,01), consequentemente dispersando a reprodução por todo o ano (F 2,9 = 1,84, P = 0,21). O modelo continuou como uma poderosa ferramenta de previsão para uso com dados de fertilidade de mamíferos, desde que os dados não se encontrem tendenciosos para fêmeas prenhas.Palavras-chave: capivara, Hydrochoerus hydrochaeris.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A model to search for birth probabilities of mammal populations using fertility data

et al. 2009

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“…Where genetic evaluation has still limited use as in developing countries, identification of descriptive linear traits and farmers' friendly tools for selecting goats with high reproduction potential may be useful for realising higher economic returns. A clear knowledge on phenotypic descriptors for the prediction of foetal number during pregnancy is essential for preventing pregnancy toxaemia, reducing dystocia, optimising birth weights and increasing the survivability of newborns (Karen et al 2006;Moallem et al 2012). Despite the use of ultrasonographic scanning for the prediction of foetal number mostly at organised farms in goats (Abdelgafar et al 2007) and sheep (Karen et al 2006), there is a dearth of information on phenotypic descriptors to differentiate the pregnant goats bearing single or multiple foetuses under field conditions.…”

Section: Introductionmentioning

confidence: 99%

“…A clear knowledge on phenotypic descriptors for the prediction of foetal number during pregnancy is essential for preventing pregnancy toxaemia, reducing dystocia, optimising birth weights and increasing the survivability of newborns (Karen et al 2006;Moallem et al 2012). Despite the use of ultrasonographic scanning for the prediction of foetal number mostly at organised farms in goats (Abdelgafar et al 2007) and sheep (Karen et al 2006), there is a dearth of information on phenotypic descriptors to differentiate the pregnant goats bearing single or multiple foetuses under field conditions. Therefore, our objectives were (1) to assess the effect of age, body weight (BW) at breeding, parity, previous litter size (LZ) and days open on LZ of does, (2) to study the changes in linear type traits in does during pregnancy and (3) to explore which traits would influence the LZ of does.…”

Section: Introductionmentioning

confidence: 99%

Influence of age, body weight, parity and morphometric traits on litter size in prolific Black Bengal goats

Pan

Biswas

Majumdar

et al. 2014

Journal of Applied Animal Research

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Data on some linear traits along with age, body weight (BW) at breeding, parity and previous litter size (LZ) of 1008 pregnant Black Bengal goats were analysed using one-way Analysis of Variance. Higher age, heavier BW at breeding, higher parity order resulted more (P < 0.01) chance of triplet or quadruplet births as compared to that of single birth. Larger previous LZ resulted larger (P < 0.01) LZ in subsequent kidding. Most of the linear traits were higher (P < 0.01 or P < 0.05) in goats bearing multiple foetuses than in the goats bearing single foetus. The results of stepwise discriminant function suggested that heart girth, punch girth, BW, distance between trochanter major and pelvic triangle area might be the predictive indices for higher LZ.

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“…The results from the scanning also make it possible to group the ewes according to the number of fetuses and adjust the feeding according to the scanning results (White and Russel 1984). An optimal feeding saves money and reduces the risk for pregnancy toxaemia, increases the birth weight and lamb survival among ewes with several fetuses (Karen and others 2006). Other methods for pregnancy diagnosis are available but none of them was found to be accurate enough to determine the number of fetuses (Humblot and others 1990, Dobson and others 1993a, b).…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the accuracy of pregnancy scanning in ewes

et al. 2013

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The objective was to evaluate the accuracy of pregnancy scanning by transabdominal ultrasonography and affecting factors. Altogether 44,783 ewes were registered (2008-2010), 39,724 diagnosed as pregnant and subsequently lambed. The ewes, 0.5-14 years old, were divided into 4 age and 6 breed groups and analysed. The accuracy (per cent; number of scanned fetuses/number of born lambs) decreased with increasing number of fetuses (P < 0.001). Overall accuracy was 90.3 per cent, highest (93.7 per cent) in ewes carrying one fetus, 91.9 per cent, 82.4 per cent, and 74.9 per cent in ewes with 2, 3 and ≥4 fetuses at scanning, respectively. Finnsheep ewes with highest number of lambs showed lowest accuracy (P < 0.001). Analyses of a more complete sub set of data (n = 23,396), showed that number of fetuses diagnosed, breed, age of ewe, operator and time in gestation, significantly affected the accuracy. Accuracy decreased with age of ewe (P < 0.001) and was 71.8 per cent, 91.6 per cent and 89.3 per cent for scanning at <40, 40-80 and 81-100 days of gestation, respectively (P < 0.001). In general, the numbers of fetuses were overestimated at scanning and increased gradually with number of fetuses diagnosed. In conclusion, the accuracy was affected by several factors, which should be considered when interpreting/implementing the results, especially in breeds with high fecundity.

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Comparison of accuracy of transabdominal ultrasonography, progesterone and pregnancy-associated glycoproteins tests for discrimination between single and multiple pregnancy in sheep

Cited by 33 publications

References 23 publications

A model to search for birth probabilities of mammal populations using fertility data

A model to search for birth probabilities of mammal populations using fertility data

Influence of age, body weight, parity and morphometric traits on litter size in prolific Black Bengal goats

Factors affecting the accuracy of pregnancy scanning in ewes

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