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Browsing by Author "Gatica Jorquera, María Carolina"
Now showing items 1-17 of 17
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Artificial long days in addition to exogenous melatonin and daily contact with bucks stimulate the ovarian and oestrous activity in Mediterranean goat females
Zarazaga Garcés, Luis Ángel
; Gatica Jorquera, María Carolina; Celi Mariátegui, Irma del Rosario; Guzmán Guerrero, José Luis; Malpaux, B. (Cambridge University Press, 2011)
One experiment was conducted to determine whether the treatment with artificial long days and exogenous melatonin can induce reproductive activity during spring (seasonal anoestrus) in Mediterranean goats that are in daily ... -
Body condition score is a critical factor determining the onset of puberty in Blanca Andaluza female goat kids
Gallego Calvo, María Lourdes; Gatica Jorquera, María Carolina; Celi Mariátegui, Irma del Rosario; Guzmán Guerrero, José Luis; Zarazaga Garcés, Luis Ángel (CSIRO Publishing, 2015)
This study examines the effect of body condition score (BCS), independently of bodyweight (BW), on the onset of puberty in Blanca Andaluza female kids born in Autumn (November). Thirty-six female kids were distributed into ... -
Effect of melatonin during the seasonal anoestrous on the reactivation of the sexual activity and semen production at the normal breeding season on mediterranean bucks
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Guzmán Guerrero, José Luis; Casas, J. P. (Universidad Autónoma de Yucatán, 2009)
One experiment was conducted to determine if the onset of the reproductive activity and semen production could be modified by a previous treatment with exogenous melatonin, used to enhance reproductive activity during the ... -
Efficacy of long day photoperiod treatment with respect to age of bucks for stimulation of the “male effect” on does at Mediterranean latitudes
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Delgado Pertíñez, Manuel; Hernández, Horacio; Guzmán Guerrero, José Luis; Delgadillo, José Alberto (Elsevier, 2022-05-05)
This study examines whether the photostimulation of sexual activity in young bucks improves the reproductive performance of the "male effect" in comparison to adult males. The experimental design was a 2x2 with to variables: ... -
Exogenous melatonin does not improve the freezability of Blanca Andaluza goat semen over exposure to two months of short days
Gallego Calvo, María Lourdes; Gatica Jorquera, María Carolina; Santiago Moreno, Julian; Guzmán Guerrero, José Luis; Zarazaga Garcés, Luis Ángel (Elsevier Masson, 2015)
This paper compares the effects of exposure to exogenous melatonin (MEL), short days (SD, 8 h of light) and long days (LD, 16 h of light), on reproductive activity, sperm motility and other reproductive variables, in Blanca ... -
The isolation of females from males to promote a later male effect is unnecessary if the bucks used are sexually active
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Hernández, H.; Gallego Calvo, María Lourdes; Delgadillo, J. A.; Guzmán Guerrero, José Luis (Elsevier, 2017)
It has been suggested that female goats in permanent contact with males become refractory to their presence, and need to be previously separated from them for 40–45 days if the presence of bucks is to induce reproductive ... -
Photoperiod-treated bucks are equal to melatonin-treated bucks for inducing reproductive behaviour and physiological functions via the “male effect” in Mediterranean goats
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Hernández, Horacio; Chemineau, Philippe; Delgadillo, J. A.; Guzmán Guerrero, José Luis (2019-01-30)
The aim of this study was to examine whether photoperiod-treated bucks have the same capacity as melatonin-treated bucks to induce reproductive responses in female goats during the spring. On 10 April, 38 anoestrous does ... -
Photoperiod-Treatment in Mediterranean Bucks Can Improve the Reproductive Performance of the Male Effect Depending on the Extent of Their Seasonality
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Delgado Pertíñez, Manuel; Hernández, Horacio; Guzmán Guerrero, José Luis; Delgadillo, J. A. (MDPI, 2021-02)
This study examines the effectiveness of the photoperiod treatment (extra light for 88 days) to render the bucks sexually active during the seasonal anoestrous in order to induce a male effect, depending on the reproductive ... -
The reproductive performance of female goats treated with melatonin is not improved after introduction to bucks displaying springtime sexual activity if these does are experiencing decreasing body weight/condition score
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Gallego Calvo, María Lourdes; Guzmán Guerrero, José Luis (Elsevier Masson, 2017)
The aim of the present work was to determine whether treatment with melatonin modifies the reproductive response of female goats experiencing increasing or decreasing body weight (BW)/body condition score (BCS) when ... -
Role of body condition score and body weight in the control of seasonal reproduction in Blanca Andaluza goats
Gallego Calvo, María Lourdes; Gatica Jorquera, María Carolina; Guzmán Guerrero, José Luis; Zarazaga Garcés, Luis Ángel (Elsevier Masson, 2014)
The reproductive activity of 84 female Blanca Andaluza goats was monitored over 17 months to determine the role of body condition score (BCS) and body weight (BW) in its control. Following a 3 × 2 factorial experimental ... -
Seasonal changes in reproductive activity, sperm variables and sperm freezability in Blanca Andaluza bucks
Gallego Calvo, María Lourdes; Gatica Jorquera, María Carolina; Santiago Moreno, Julian; Guzmán Guerrero, José Luis; Zarazaga Garcés, Luis Ángel (Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), 2015)
Interest in the preservation of endangered breeds such as the Blanca Andaluza goat, has increased and some steps should be therefore taken to ensure it. The study was designed to determine the seasonal reproductive pattern ... -
The High Testosterone Concentrations of the Bucks Used in the “Male Effect” Is Not a Prerequisite for Obtaining High Ovarian Activity in Goats from Mediterranean Latitudes
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Rosa Lucas, Ignacio de la; Delgado Pertíñez, Manuel; Guzmán Guerrero, José Luis (MDPI, 2022)
Two experiments were carried out. Firstly, 54 anestrous females were placed in contact with photostimulated males (Photo; n = 27) or with no photostimulated males (Natural; n = 27). Moreover, a group of bucks treated ... -
The introduction of sexually active bucks at different moments of the oestrous cycle does not modify the NEFAs or the IGF-1 concentrations
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Guzmán Guerrero, José Luis (2021-04-30)
Non-esterified fatty acids (NEFAs) and Insulin-like growth factor-I (IGF-1) concentrations are modified after the induction of a "male effect". The present study examined the effect of the introduction of males into a ... -
The reproductive response to the male effect of 7- or 10-month-old female goats is improved when photostimulated males are used
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Hernández, Horacio; Keller, Matthieu; Chemineau, Philippe; Delgadillo, J. A.; Guzmán Guerrero, José Luis (Elsevier, 2019-01-09)
The exposure of adult, female, Mediterranean goats during anoestrus to males with induced sexual activity via photostimulation, induces a very high percentage of ovulations. The present work examines the ability of ... -
The use of photoperiod-treated bucks to induce a “male effect” does not compensate for the negative effects of nutritional restriction of the females in Mediterranean goats
Zarazaga Garcés, Luis Ángel; Gatica Jorquera, María Carolina; Rosa, Ignacio de la; Guzmán Guerrero, José Luis (Elsevier, 2021-10)
This work examined the effect of acute nutritional restriction or supplementation one week before male introduction on the reproductive performances of the “male effect” when using photostimulated or control males in goats. ... -
Utilización de fotoperiodo artificial, melatonina exógena y/o efecto macho para la mejora de los parámetros reproductivos de caprinos mediterráneos
(Universidad de Huelva, 2012)El objetivo de este trabajo ha sido evaluar la utilización del fotoperiodo artificial, la aplicación de melatonina y el efecto macho para inducir actividad reproductiva durante el periodo de anestro estacionario en ... -
Utilización de fotoperiodo e implantes de melatonina para el control de la reproducción en caprinos mediterráneos
Gatica Jorquera, María Carolina; Celi Mariátegui, Irma del Rosario; Guzmán Guerrero, José Luis; Zarazaga Garcés, Luis Ángel (Veterinaria Organización, 2012)
El fotoperiodo es el principal factor medioambiental que controla la actividad reproductiva en caprino y es interpretado por el animal por la variación en la secreción de melatonina. La especie caprina presenta variaciones ...
