Breeding soundness examinations of rams and bucks, a review

Ott, R.S.; Memon, M.A.

doi:10.1016/0093-691x(80)90124-7

Cited by 35 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Previous reports indicated that testicular size positively correlated with sperm production in bulls, rams, boars, stallions [40, 41], and WAD and cashmere goats [15, 42]. Therefore, the TW and related size parameters would be imperative in selecting sire that is reproductively sound as proposed by Ott and Memon [43]. Scrotal size parameters (SC, SL) correlated with BW, TW, and sperm output in this study, similar to earlier reports [23, 25, 26, 43–48].…”

Section: Discussionmentioning

confidence: 99%

Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

Abba

Igbokwe

2015

Veterinary Medicine International

View full text Add to dashboard Cite

Testicular sizes of animals are important for identification of those with adequate sperm production. The aim of this study was to define the testicular and related size estimates that would be associated with optimal cauda epididymal sperm counts (ESC) in Sahel goats based on postmortem evaluations. A stratified quota sample population of 125 male goats inclusive of all testicular sizes was taken at a slaughterhouse in Maiduguri, Nigeria. The bucks were aged 18–30 months and weighed 17.04 ± 2.99 (12–25) kg. Body, testicular, and epididymal weights of each goat with other related size measurements were estimated. ESC was determined from homogenized tissue using a manual cytometer. At the cut-off ESC of >1.1 × 109 sperm heads, 66 (52.80%) of the goats had optimal ESC which was associated with testicular weight of 59.90 ± 16.10 (31.40–86.20) g, gonadosomatic index of 3.51 ± 0.69 (2.00–4.50) g/kg, and scrotal circumference of 19.07 ± 1.29 (17.00–21.80) cm. The size variables of the scrotum and testis correlated with one another and with the ESC. These findings provide data that may be used to anticipate adequate antemortem sperm reserve based on testicular size during preliminary selection of sires for breeding from a sexually mature Sahel buck population.

show abstract

Section: Discussionmentioning

confidence: 99%

Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

Abba

Igbokwe

2015

Veterinary Medicine International

View full text Add to dashboard Cite

show abstract

“…In small ruminants, the epididymal sperm reserves available each day for ejaculation are readily depleted, with approximately 62% of the potential daily sperm collection being obtained in the first two ejaculates. Epididymal replenishment is fairly rapid, and in well-managed facilities sperm has been collected twice a day at 24-h intervals (Eaton and Simmons, 1952;Ott and Memon, 1980). Testicular characteristics such as shape, symmetry, mobility, position and sensibility --11-12 ------24:33 -----12-13 ------25:06 -----13-14 ------20:30 -----14-15 ------23:06 -----15-16 ------24:15 -----16-17 ------37:00 -----°I ntervals between ejaculations.…”

Section: Resultsmentioning

confidence: 99%

Behavioural and seminal characteristics of Santa Ines rams subjected to successive semen collections in the Amazonian region

Oliveira¹,

Pinho²,

Vicente³

et al. 2012

Italian Journal of Animal Science

View full text Add to dashboard Cite

The objective of this study was to evaluate the reproductive performance of Santa Ines rams subjected to successive semen collections in an Amazonian climate. Four rams were subjected to successive ejaculations during a maximum period of three hours. This procedure was repeated three times at 15-day intervals. Sexual and behavioural (libido) and andrological (testicular and seminal) assessments were performed. A total of 81 ejaculates were collected. Libido and semen vigour, volume, appearance and concentration decreased as the ejaculation frequency increased (P<0.05) and sperm motility showed a decreasing trend (P=0.06). The seminal pH increased over the sequence of collections (P<0.05). The only significant differences observed between individual rams were the variable scrotal circumference and the percentages of live sperm and sperm abnormalities (P<0.05). All the parameters of the first ejaculation were within the normal range for this species, which suggests that the local climatic conditions (high temperature and humidity) did not affect the behavioural, testicular or seminal parameters of experimental rams. Our findings indicate that the reproductive performance of Santa Ines rams could be affected by the intensification of ejaculation frequency; however, individual male variation needs to be taken into consideration.

show abstract

“…All rams were designated satisfactory following a standard breeding soundness evaluation (Ott and Memon 1980) and they were randomly allocated into one of six treatment groups. The experiment was a 2 × 3 factorial, with scrotal insulation (insulated or not insulated) and three oxygen concentrations in inspired air (14, 21 or 85%).…”

Section: Methodsmentioning

confidence: 99%

Hyperthermia and not hypoxia may reduce sperm motility and morphology following testicular hyperthermia

Kastelic¹,

Wilde²,

Rizzoto³

et al. 2017

Vet. Med.

View full text Add to dashboard Cite

ABSTRACT:The mammalian testis typically operates on the brink of hypoxia; the long-standing dogma is that increased testicular temperature increases metabolism, but blood flow is unaffected and the resulting hypoxia reduces sperm motility and morphology. In rats and mice, oxygen (O 2 ) content of inspired air affected O 2 content of testes, enabling the latter to range from approximately 50 to more than 200% of physiologic concentrations. A ram model was used to test the hypotheses that hypoxia would disrupt sperm motility and morphology and that hyperoxia would prevent hyperthermia-induced reductions in sperm motility and morphology. Eighteen Canadian Arcott rams (approximately 10 months old) were used in a 2 × 3 factorial, with factors being scrotal insulation (insulated or not insulated) and O 2 concentrations in inspired air (14, 21 or 85%). Six rams, three with and three without scrotal insulation, were placed in each of three enclosed areas for 30 h to expose them to their respective oxygen concentrations, with scrotal insulation removed at the end of the exposure. Semen was collected by electro-ejaculation twice before insulation, bi-weekly for four weeks starting one week after exposures, and then once weekly for two weeks. There were effects of insulation, time and an insulation × time interaction for motile sperm and sperm that had normal morphology or head or midpiece defects (P < 0.01 for each). Sperm motility and morphology exhibited alterations between approximately two and five weeks after insulation, with mean progressively motile and morphologically normal sperm decreasing from approximately 55 to 35% and from 80 to 30%, respectively, and with head and midpiece defects increasing from approximately 3 to 50% and from 10 to 20% (P < 0.05 for each). The hypotheses that hypoxia would disrupt sperm quality and production, whereas hyperoxia would prevent hyperthermia-induced reductions in sperm quality and production, were not supported. This is apparently the first report that heat-stress induced damage to sperm was due to increased temperature per se and not testicular hypoxia, calling into question a long-standing paradigm.

show abstract

Breeding soundness examinations of rams and bucks, a review

Cited by 35 publications

References 16 publications

Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

Behavioural and seminal characteristics of Santa Ines rams subjected to successive semen collections in the Amazonian region

Hyperthermia and not hypoxia may reduce sperm motility and morphology following testicular hyperthermia

Contact Info

Product

Resources

About