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142. | | GUAL, I.; GIANNITTI, F.; HECKER ,Y.P.; SHIVERS, J.; ENTROCASSI, A.C.; MORRELL ,E.L.; PARDINI, L.; FIORENTINO ,M.A.; RODRÍGUEZ FERMEPIN ,M.; UNZAGA ,J.M.; CANTÓN, G.J.; VENTURINI, M.C.; MOORE, D.P. First case report of Toxoplasma gondii-induced abortions and stillbirths in sheep in Argentina. Veterinary Parasitology: Regional Studies and Reports , v.12, p. 39-42, 2018. History article: Received 4 October 2017 // Received in revised form 8 January 2018// Accepted 9 January 2018 //Available online 11 January 2018.Biblioteca(s): INIA La Estanzuela. |
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144. | | ABELLA, I.; JAURENA, M.; RAMOS, Z.; PREVE, F.; GRATTAROLA, M.; DE BARBIERI, I. Experiencias en la producción de lanas finas en sistemas comerciales del Basalto. In: DE BARBIERI, I.; RAMOS, Z.; MONTOSSI, F. (Ed.). Lana superfina: un camino conjunto de la investigación, la transferencia y la producción. Montevideo (Uruguay): INIA, 2018. p. 11-30 (INIA Serie Técnica; 242)Biblioteca(s): INIA Tacuarembó. |
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Registro completo
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Biblioteca (s) : |
INIA Tacuarembó. |
Fecha actual : |
14/03/2017 |
Actualizado : |
13/01/2020 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Circulación / Nivel : |
Internacional - -- |
Autor : |
VAN LIER, E.; HART, K.W.; VIÑOLES, C.; PAGANONI, B.; BLACHE, D. |
Afiliación : |
E. VAN LIER, Universidad de la República (UdelaR)/ Facultad de Agronomía; K. W. HART; CAROLINA VIÑOLES GIL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; B. PAGANONI; D. BLACHE. |
Título : |
Calm Merino ewes have a higher ovulation rate and more multiple pregnancies than nervous ewes. |
Fecha de publicación : |
2017 |
Fuente / Imprenta : |
Animal, 2017, v. 11, no. 7, p. 1196-1202. |
DOI : |
10.1017/S1751731117000106 |
Idioma : |
Inglés |
Notas : |
Article history: Received 15 June 2016; Accepted 13 December 2016. |
Contenido : |
In 1990, two selection lines of Merino sheep were established for low and high behavioural reactivity (calm and nervous temperament) at the University of Western Australia. Breeding records consistently showed that calm ewes weaned 10% to 19% more lambs than the nervous ewes. We hypothesise that calm ewes could have a higher ovulation rate than nervous ewes and/or calm ewes could have a lower rate of embryo mortality than nervous ewes. We tested these hypotheses by comparing the ovulation rate and the rate of embryo mortality between the calm and nervous lines before and after synchronisation and artificial insemination. Merino ewes from the temperament selection lines (calm, n = 100; nervous, n = 100) were synchronised (early breeding season) for artificial insemination (day 0) (intravaginal sponges containing fluogestone acetate and eCG immediately after sponge withdrawal). On day-17 and 11 ovarian cyclicity and corpora lutea, and on days 30 and 74 pregnancies and embryos/foetuses were determined by ultrasound. Progesterone, insulin and leptin concentrations were determined in blood plasma samples from days 5, 12 and 17. Ovarian cyclicity before and after oestrus synchronisation did not differ between the lines, but ovulation rate did (day-17: calm 1.63; nervous 1.26; P<0.01; day 11: calm 1.83; nervous 1.57; P<0.05). Ovulation rate on day 11 in nervous ewes was higher than on day-17. Loss of embryos by day 30 was high (calm: 71/150; nervous: 68/130); but nervous ewes had a lower proportion (15/47) of multiple pregnancies compared with calm ewes (30/46; P<0.01). Reproductive loss between days 30 and 74 represented 7.3% of the overall loss. Temperament did not affect concentrations of progesterone, but nervous ewes had higher insulin (32.0 pmol/l ± 1.17 SEM; P = 0.013) and lower leptin (1.18 μg/l ± 0.04 SEM; P = 0.002) concentrations than calm ewes (insulin: 27.8 pmol/l ± 1.17 SEM; leptin: 1.35 μg/l ± 0.04 SEM). The differences in reproductive outcomes between the calm and nervous ewes were mainly due to a higher ovulation rate in calm ewes. We suggest that reproduction in nervous ewes is compromised by factors leading up to ovulation and conception, or the uterine environment during early pregnancy, that reflect differences in energy utilisation. MenosIn 1990, two selection lines of Merino sheep were established for low and high behavioural reactivity (calm and nervous temperament) at the University of Western Australia. Breeding records consistently showed that calm ewes weaned 10% to 19% more lambs than the nervous ewes. We hypothesise that calm ewes could have a higher ovulation rate than nervous ewes and/or calm ewes could have a lower rate of embryo mortality than nervous ewes. We tested these hypotheses by comparing the ovulation rate and the rate of embryo mortality between the calm and nervous lines before and after synchronisation and artificial insemination. Merino ewes from the temperament selection lines (calm, n = 100; nervous, n = 100) were synchronised (early breeding season) for artificial insemination (day 0) (intravaginal sponges containing fluogestone acetate and eCG immediately after sponge withdrawal). On day-17 and 11 ovarian cyclicity and corpora lutea, and on days 30 and 74 pregnancies and embryos/foetuses were determined by ultrasound. Progesterone, insulin and leptin concentrations were determined in blood plasma samples from days 5, 12 and 17. Ovarian cyclicity before and after oestrus synchronisation did not differ between the lines, but ovulation rate did (day-17: calm 1.63; nervous 1.26; P<0.01; day 11: calm 1.83; nervous 1.57; P<0.05). Ovulation rate on day 11 in nervous ewes was higher than on day-17. Loss of embryos by day 30 was high (calm: 71/150; nervous: 68/130); but nervous ewes had a... Presentar Todo |
Palabras claves : |
EMBRYO; INSULIN; LEPTIN; OVIS ARIES; PROGESTERONE. |
Thesagro : |
OVINOS. |
Asunto categoría : |
L01 Ganadería |
Marc : |
LEADER 03073naa a2200265 a 4500 001 1056829 005 2020-01-13 008 2017 bl uuuu u00u1 u #d 024 7 $a10.1017/S1751731117000106$2DOI 100 1 $aVAN LIER, E. 245 $aCalm Merino ewes have a higher ovulation rate and more multiple pregnancies than nervous ewes.$h[electronic resource] 260 $c2017 500 $aArticle history: Received 15 June 2016; Accepted 13 December 2016. 520 $aIn 1990, two selection lines of Merino sheep were established for low and high behavioural reactivity (calm and nervous temperament) at the University of Western Australia. Breeding records consistently showed that calm ewes weaned 10% to 19% more lambs than the nervous ewes. We hypothesise that calm ewes could have a higher ovulation rate than nervous ewes and/or calm ewes could have a lower rate of embryo mortality than nervous ewes. We tested these hypotheses by comparing the ovulation rate and the rate of embryo mortality between the calm and nervous lines before and after synchronisation and artificial insemination. Merino ewes from the temperament selection lines (calm, n = 100; nervous, n = 100) were synchronised (early breeding season) for artificial insemination (day 0) (intravaginal sponges containing fluogestone acetate and eCG immediately after sponge withdrawal). On day-17 and 11 ovarian cyclicity and corpora lutea, and on days 30 and 74 pregnancies and embryos/foetuses were determined by ultrasound. Progesterone, insulin and leptin concentrations were determined in blood plasma samples from days 5, 12 and 17. Ovarian cyclicity before and after oestrus synchronisation did not differ between the lines, but ovulation rate did (day-17: calm 1.63; nervous 1.26; P<0.01; day 11: calm 1.83; nervous 1.57; P<0.05). Ovulation rate on day 11 in nervous ewes was higher than on day-17. Loss of embryos by day 30 was high (calm: 71/150; nervous: 68/130); but nervous ewes had a lower proportion (15/47) of multiple pregnancies compared with calm ewes (30/46; P<0.01). Reproductive loss between days 30 and 74 represented 7.3% of the overall loss. Temperament did not affect concentrations of progesterone, but nervous ewes had higher insulin (32.0 pmol/l ± 1.17 SEM; P = 0.013) and lower leptin (1.18 μg/l ± 0.04 SEM; P = 0.002) concentrations than calm ewes (insulin: 27.8 pmol/l ± 1.17 SEM; leptin: 1.35 μg/l ± 0.04 SEM). The differences in reproductive outcomes between the calm and nervous ewes were mainly due to a higher ovulation rate in calm ewes. We suggest that reproduction in nervous ewes is compromised by factors leading up to ovulation and conception, or the uterine environment during early pregnancy, that reflect differences in energy utilisation. 650 $aOVINOS 653 $aEMBRYO 653 $aINSULIN 653 $aLEPTIN 653 $aOVIS ARIES 653 $aPROGESTERONE 700 1 $aHART, K.W. 700 1 $aVIÑOLES, C. 700 1 $aPAGANONI, B. 700 1 $aBLACHE, D. 773 $tAnimal, 2017$gv. 11, no. 7, p. 1196-1202.
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