JOSE LUIS
GUZMAN GUERRERO
CATEDRATICO DE UNIVERSIDAD
Universidad Arturo Prat
Iquique, ChilePublicacions en col·laboració amb investigadors/es de Universidad Arturo Prat (21)
2022
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Efficacy of long day photoperiod treatment with respect to age of bucks for stimulation of the “male effect” on does at Mediterranean latitudes
Small Ruminant Research, Vol. 212
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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
Animals, Vol. 12, Núm. 8
2021
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Photoperiod-treatment in mediterranean bucks can improve the reproductive performance of the male effect depending on the extent of their seasonality
Animals, Vol. 11, Núm. 2, pp. 1-12
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The introduction of sexually active bucks at different moments of the oestrous cycle does not modify the NEFAs or the IGF-1 concentrations
Italian Journal of Animal Science, Vol. 20, Núm. 1, pp. 707-716
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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
Research in Veterinary Science, Vol. 139, pp. 177-185
2019
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Effect of body condition and melatonin implants, inserted at different times of the year, on ovarian activity in goats maintained without male contact from the time of implantation
Animal Production Science, Vol. 59, Núm. 6, pp. 1048-1055
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Photoperiod-treated bucks are equal to melatonin-treated bucks for inducing reproductive behaviour and physiological functions via the “male effect” in Mediterranean goats
Animal Reproduction Science, Vol. 202, pp. 58-64
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The reproductive response to the male effect of 7- or 10-month-old female goats is improved when photostimulated males are used
Animal, Vol. 13, Núm. 8, pp. 1658-1665
2018
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Reproductive responses to sexually active buck of does treated with melatonin when body weight/body condition is increasing or decreasing
Animal Reproduction Science, Vol. 190, pp. 75-84
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When using photostimulated bucks to induce the male effect in female goats living at Mediterranean latitudes, a male: Female ratio of 1:20 is optimum
Journal of Applied Animal Research, Vol. 46, Núm. 1, pp. 883-887
2017
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The isolation of females from males to promote a later male effect is unnecessary if the bucks used are sexually active
Theriogenology, Vol. 95, pp. 42-47
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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
Animal Reproduction Science, Vol. 179, pp. 57-66
2015
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Body condition score is a critical factor determining the onset of puberty in Blanca Andaluza female goat kids
Animal Production Science, Vol. 55, Núm. 9, pp. 1179-1183
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Exogenous melatonin does not improve the freezability of Blanca Andaluza goat semen over exposure to two months of short days
Animal Reproduction Science, Vol. 157, pp. 24-32
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Reproductive performance response to the male effect in goats is improved when doe live weight/body condition score is increasing
Animal Reproduction Science, Vol. 156, pp. 51-57
2014
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No previous isolation of female goats is required for novel males to induce a male effect, especially if direct physical contact is established
Theriogenology, Vol. 82, Núm. 9, pp. 1310-1315
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Role of body condition score and body weight in the control of seasonal reproduction in Blanca Andaluza goats
Animal Reproduction Science, Vol. 151, Núm. 3-4, pp. 157-163
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The timing of oestrus, the preovulatory LH surge and ovulation in Blanca Andaluza goats synchronised by intravaginal progestagen sponge treatment is modified by season but not by body condition score
Animal Reproduction Science, Vol. 146, Núm. 3-4, pp. 170-175
2013
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Exogenous melatonin after a treatment of artificial long days is able to increase LH secretion during seasonal anoestrus in Payoya goats
Journal of Applied Animal Research, Vol. 41, Núm. 1, pp. 34-38
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Influence of the male effect on the reproductive performance of female Payoya goats implanted with melatonin at the winter solstice
Animal Reproduction Science, Vol. 137, Núm. 3-4, pp. 183-188