Reproductive behavior in hair sheep rams under tropical conditions

Aké-Villanueva, Jesús Ricardo; Aké-López, Jesús Ricardo; Magaña-Monforte, Juan Gabriel; Segura-Correa, JC

doi:10.1007/s11250-019-01856-8

Cited by 12 publications

(18 citation statements)

References 34 publications

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“…Docosahexaenoic acids are major elements for human and ruminants’ spermatozoa phospholipids [ 50 ]. DHA makes up 30% of esterified fatty acids in phospholipids and 73% of all PUFAs [ 7 ]. Therefore, neurons, photoreceptors, and spermatozoa are the cells richest in DHA content [ 47 ].…”

Section: Interaction Between Docosahexaenoic Acid (Dha) and Spermatogenesismentioning

confidence: 99%

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Flaxseed Oil as a Source of Omega n-3 Fatty Acids to Improve Semen Quality from Livestock Animals: A Review

Ngcobo

Ramukhithi

Nephawe

et al. 2021

Animals

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The demand to conserve indigenous species through the cryo-gene bank is increasing. Spermatozoa remain sensitive to cryopreservation damages especially that of avian species thus limiting the use of reproductive biotechnologies such as artificial insemination in the conservation programs. Long-chain polyunsaturated fatty acid (LCPUFAs), specifically omega n-3, expanded a research interest to improve animal reproductive efficiency through improving spermatozoa quality. This is driven by the fact that mammals cannot synthesize omega-3 de-novo because they lack delta-12 and delta-15 desaturase enzymes thus supplemented in the diet is mandatory. Delta-12 and delta-15 add a double bond at the 12th and 15th carbon-carbon bond from the methyl end of fatty acids, lengthening the chain to 22 carbon molecules. Fish oil is a pioneer source of omega n-3 and n-6 fatty acids. However, there is a report that numerous fisheries are over-exploited and could collapse. Furthermore, processing techniques used for processing by-products could complement alterations of the amino acid profile and reduce protein retrieval. Alternatively, flaxseed oil contains ±52–58% of total fatty acids and lignans in the form of α-linolenic and linoleic acid. Alpha-linolenic acid (ALA,18:3n-3) is enzymatically broken-down de-novo by delta-6 desaturase and lengthened into a long-chain carbon molecule such as eicosapentaenoic acid (C20:5n-3). Nevertheless, controversial findings following the enrichment of diet with flaxseed oil have been reported. Therefore, this paper is aimed to postulate the role of flaxseed oil as an alternative source of omega n-3 and n-6 fatty acids to improve semen quality and quantity from livestock animals. These include the interaction between docosahexaenoic acid (DHA) and spermatogenesis, the interaction between docosahexaenoic acid (DHA) and testicular cells, and the effect of flaxseed oil on semen quality. It additionally assesses the antioxidants to balance the level of PUFAs in the semen.

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Section: Interaction Between Docosahexaenoic Acid (Dha) and Spermatogenesismentioning

confidence: 99%

“…However, there are impediments hampering their reproduction efficiencies. Among various impediments, ±20% of males are incompatible for mating during the breeding season [ 7 ]. Moreover, another ±10 to 15% of males show a decreased reproduction efficiency or questionable fertility and semen quality [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Flaxseed Oil as a Source of Omega n-3 Fatty Acids to Improve Semen Quality from Livestock Animals: A Review

Ngcobo

Ramukhithi

Nephawe

et al. 2021

Animals

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“…Therefore, a test is recommended to evaluate the reproductive variables in males, at least between 6 and 8 weeks before the beginning of mating, sufficient time to solve possible reproductive problems that rams can present (Ridler et al, 2012). After undergoing tests such as capacity for mating and semen evaluation, it is known that up to 36% of the rams can be non-apt for reproduction and are the possible cause of low fertility in the flock (Aké-Villanueva et al, 2019).…”

Section: Seminal Quality Testsmentioning

confidence: 99%

Reproductive management of the ram (Ovis orientalis aries)

Cruz-Espinoza

Gallegos‐Sánchez

Mendieta-Galán

et al. 2021

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Objective: To describe briefly the physiology, the anatomy and the reproductive management of the ram. Design/Methodology/Approach: Review of the anatomy, physiology and general considerations for an adequate reproductive management of the ram. Results: The ram presents a less seasonal reproductive activity than the female and its reproductive behavior is easier to observe. However, it is in the fall, the reproductive season of seasonal sheep, when their behavior is much more complex and complete. It begins with smelling the external genitals of the female, goes through the flehmen response and ends with mating, intromission and ejaculation. It is necessary to consider the anatomical and physiological aspects of the ram and its meticulous management to avoid reproductive failures in the flock. Frequently, the rams are less important for the flock’s handler during the season of reproductive rest. Monitoring their diet and parasite and disease control is necessary to keep them apt for reproduction. The evaluation of the reproductive aptitude of the ram before mating is convenient and can be planned as part of its management; and once mating begins, considering the adequate proportion of rams/females, in addition to monitoring their performance during this event. Study Limitations/Implications: To consider that the ram shows a good capacity for mating, capacity for service, libido, quality of semen, since it is responsible for a proportion of lamb production. Findings/Conclusions: Reproduction in sheep is regulated by the photoperiod, genetic potential, nutritional status, health status and other factors, which are important both in the ram and in the female. Some sheep breeds have potential of prolificacy; a good reproductive management of the ram can influence these factors and increase the reproduction rate in the flocks.

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“…Ram reproductive performance is highly variable among breeds and is affected by the environment (Sánchez‐Dávila et al., 2020), age (Santos et al., 2015) or their sexual experience (Aké‐Villanueva et al., 2019). Hormone treatments can increase the reproductive performance of rams (Ungerfeld et al., 2014, 2020), since testosterone propionate (Tejada et al., 2017) or eCG (Ungerfeld et al., 2014) has been administered to increase the ram ability to stimulate the number of ewes that respond to the ram effect.…”

Section: Introductionmentioning

confidence: 99%

Cloprostenol enhances sexual behaviour and semen quality in growing lambs more effectively than Dinoprost

Sánchez-Dávila

Hernández-Melo

Ledezma-Torres

et al. 2022

Reprod Domestic Animals

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Analogues of PGF2α have been used in boars with positive results on sexual behaviour, but limited impact on semen quality. The objective of this study was to determine whether the administration of Dinoprost tromethamine or D‐Cloprostenol enhances the sexual behaviour and semen quality of sexually inexperienced growing lambs during the onset of the breeding season. The study lasted 10 weeks, beginning during the non‐breeding season, with 24 sexually inexperienced Katahdin lambs (5.1 ± 0.5 months old). Three groups of eight lambs each received: (1) vehicle treatment (group CON); (2) 10 mg of Dinoprost tromethamine (group DIN); or (3) 0.15 mg of Cloprostenol dextrogy (group CLOP). The treatments were all applied im 5 min before the tests of sexual behaviour, or 20 min before the collection of semen. Sexual behaviour was evaluated twice weekly in a pen test with a non‐oestrous ewe, and semen was collected once weekly with an artificial vagina. The latency to begin courtship was significantly shorter in both groups that received analogues of PGF2α than in CON lambs. The number of ano‐genital sniffs, flehmens and lateral approaches was greater in both treated groups than in CON lambs (p < .05). Lambs from DIN group mounted significantly more than CLOP and CON lambs, which did not differ. However, CLOP lambs showed significantly greater mating efficiency (i.e. ejaculations/total mounts) than CON lambs, which exhibited significantly greater mating efficiency that DIN lambs. Lambs treated with CLOP produced significantly more semen volume with more mass motility than those treated with DIN and CON (without differences between DIN and CON). Overall, we concluded that the administration of cloprostenol or dinoprost before sexual evaluation in young rams enhances their sexual behaviour. Cloprostenol had greater effects than dinoprost. The administration of cloprostenol before semen collection also triggered the ejaculation of a greater volume of semen, with greater mass motility. These results open interesting possibilities to study deeply the use of simple and cost‐effective treatments to improve the reproductive results of young growing rams.

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Reproductive behavior in hair sheep rams under tropical conditions

Cited by 12 publications

References 34 publications

Flaxseed Oil as a Source of Omega n-3 Fatty Acids to Improve Semen Quality from Livestock Animals: A Review

Flaxseed Oil as a Source of Omega n-3 Fatty Acids to Improve Semen Quality from Livestock Animals: A Review

Reproductive management of the ram (Ovis orientalis aries)

Cloprostenol enhances sexual behaviour and semen quality in growing lambs more effectively than Dinoprost

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