Alternative methods for control of reproduction in small ruminants: A focus on the needs of grazing industries

Delgadillo, J.A.; Martin, Graeme

doi:10.2527/af.2015-0009

Cited by 28 publications

(33 citation statements)

References 27 publications

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“…The latter is relevant since we showed that the components of the milk were not modified due to the light treatment and therefore the price of the milk would not be reduced. Moreover, it is well known that the induction of ovulation through the male effect in anovulatory females allows an early pregnancy and thus early born (September) of the goat kids which, after their weaning, can be sold at a better price due to their scarce availability at that time (Delgadillo & Martin, ).…”

Section: Resultsmentioning

confidence: 99%

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Subtropical goats ovulate in response to the male effect after a prolonged treatment of artificial long days to stimulate their milk yield

Mendieta

Delgadillo

Flores

et al. 2018

Reprod Domestic Animals

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The objectives of this study were to determine (i) if in subtropical goats that gave birth during mid-December, the exposition to an artificial long-day photoperiod consisting in only 14 hr of light per day can increase the milk yield and (ii) to test whether these females can respond to the male effect at the end of the prolonged photoperiodic treatment. In experiment 1, 17 lactating goats were maintained under natural short days (control group), while another 22 goats were maintained under artificial long days (treated group) consisting in 14 hr light and 10 hr darkness starting at day 10 of lactation. The continuous exposition to an artificial long-day photoperiod produced an increase in the milk yield level during the first 110 days of lactation (time × treatment interaction; p = .01), while none of the milk components were modified due to the photoperiodic treatment (p > .05). In experiment 2, all control and treated anovulatory goats were submitted to the male effect using photostimulated males. All females showed oestrous behaviour within the first 10 days that were in contact with males (100% in both groups; p > .05). Thus, the latency to onset of oestrus did not differ between females from control (58.2 ± 3.0 hr) and treated (62 ± 4.6 hr) groups. Male exposition provoked ovulation independently if females were previously under long days or natural photoperiod (96 vs 100%, respectively; p = .79). It was concluded that exposure to 14 hr of light per day in subtropical goats that gave birth in late autumn stimulates milk yield without preventing the ovulation in response to the male effect at the end of the prolonged photoperiodic treatment.

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Section: Resultsmentioning

confidence: 99%

“…Moreover, it is well known that the induction of ovulation through the male effect in anovulatory females allows an early pregnancy and thus early born (September) of the goat kids which, after their weaning, can be sold at a better price due to their scarce availability at that time (Delgadillo & Martin, 2015).…”

Section: Con Clus Ionmentioning

confidence: 99%

Subtropical goats ovulate in response to the male effect after a prolonged treatment of artificial long days to stimulate their milk yield

Mendieta

Delgadillo

Flores

et al. 2018

Reprod Domestic Animals

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“…Goat milk production varies from year to year, and is seasonal due to natural reproductive periods (Delgadillo & Martin, 2015;Flores-Najera et al, 2010;Hoyos & Salinas, 1994;Mellado & Meza-Herrera, 2002;Rosales-Nieto et al, 2011), as well as to the food availability during rainy season and feed residues from seasonal harvests (Hoyos, Salinas, & Sáenz, 1992). Also, milk production largely depends on the shape of the lactation curve.…”

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confidence: 99%

Physicochemical characterization of goat milk produced in the Comarca Lagunera, Mexico

Isidro‐Requejo

Meza-Herrera

Pastor-López

et al. 2019

Animal Science Journal

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The purpose of this study was to determine goat milk physicochemical parameters during the feed scarcity season. An evaluation was made for 398 milk samples from 80 multiparous goats belonging to three different production systems: (S1) mechanized milking grazing pasture and harvested residue (alfalfa) and grain supplemented; (S2) system grazing native pasture; and (S3) system grazing native pasture and grain supplemented. The general averages were: fat (FT) 4.0 ± 0.20%, protein (PR) 3.3 ± 0.05%, lactose (LC) 4.9 ± 0.09%, nonfat solids (NFS) 8.9 ± 0.13%, total solids (TS) 14.5 ± 0.20%, temperature (TM) 24.6 ± 1.06°C, and acidity (pH) 6.7 ± 0.049. Most of the physicochemical components of milk were affected (p < 0.0001) by the production system × month interaction and production system × group × month interaction. The FT content was higher (p < 0.05) in S2 (4.56 ± 0.18) than in S1 (3.64 ± 0.20) and S3 (3.50 ± 0.20). LC differed (p < 0.05) in S2 (5.07 ± 0.08) than in S1 (4.77 ± 0.09) and S3 (4.70 ± 0.09). No differences were observed for the rest of the variables (p < 0.05) among the production systems. The study unveiled a higher content of FT, LC, NFS, PR, and TS for S2 than for S1 and S3. This higher content may be explained because S2 only grazed on herbs and shrubs, in contrast to S1 and S3 which were additionally supplemented with grain concentrates.

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“…This characteristic varies mainly according to the hours of daylight (photoperiod), rasse, and nutrition [1]. It is mentioned that the more goat is exploited at latitudes more distant from the equator, the breeding season will be shorter [2]. However, in latitudes nearer from the equator, the presence of estrus will depend on the availability of nutrients and the environment.…”

Section: Introductionmentioning

confidence: 99%

“…However, in latitudes nearer from the equator, the presence of estrus will depend on the availability of nutrients and the environment. On average, the goat's estrus cycle is 21 days, and the high frequency of short estrual cycle is characteristic and tends to occur at the beginning of the reproductive season and in young animals [1,2]. The average duration of standing estrus is 36 hours but can range from 24 to 48 hours depending on age, breed, season, and presence of a male [3].…”

Section: Introductionmentioning

confidence: 99%

Reproduction in Goats

Sánchez-Dávila¹,

González²,

Barragán³

2018

Goat Science

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Reproductive activity of the goat begins when the females reach puberty, which happens at 5 months of age. The ovarian or estrous cycle is the period between two consecutive estrus. It is also the time that lasts the development of the follicle in the ovary, until rupture occurs and ovulation takes place, which coincides with the appearance of estrus. This chapter will describe the physiological and endocrinological bases of estrus in the goat. Likewise, factors affecting the presence of estrus and ovulation will be described. At another point, synchronization of estrus and ovulation, factors affecting the presence of estrus and external symptoms of estrus, will be described.To achieve synchronization of estrus or induction of ovulation within or outside the breeding season, it may be necessary to manage light hours, male effect, and/or use of hormones. The importance of artificial insemination is described, as well as the current situation of this technique worldwide. Currently, the techniques of artificial insemination in goats have been limited worldwide, due to the lack of resources of producers and trained technicians. The techniques of artificial insemination with estrous synchronization programs and ovulation with current research results will be described.

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Alternative methods for control of reproduction in small ruminants: A focus on the needs of grazing industries

Cited by 28 publications

References 27 publications

Subtropical goats ovulate in response to the male effect after a prolonged treatment of artificial long days to stimulate their milk yield

Subtropical goats ovulate in response to the male effect after a prolonged treatment of artificial long days to stimulate their milk yield

Physicochemical characterization of goat milk produced in the Comarca Lagunera, Mexico

Reproduction in Goats

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