Sexual activity and body and testis growth in prepubertal ram lambs of Friesland, Chios, Karagouniki and Serres dairy sheep in Greece

Belibasaki, S.; Kouimtzis, S.

doi:10.1016/s0921-4488(99)00131-5

Cited by 40 publications

(21 citation statements)

References 11 publications

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“…Puberty in crossbreds in the present study was delayed compared to what was reported in the literature (Belibasaki and Kouimtzis, 2000;Al-Molla and Kridli, 2003). This may have been caused by several reasons including breeds, birth date and temperature.…”

Section: Puberty In Ewe Lambscontrasting

confidence: 67%

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Age at Puberty and Some Biological Parameters of Awassi and its First Crosses with Charollais and Romanov Rams

Kridli

Abdullah

Shaker

et al. 2006

Italian Journal of Animal Science

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The aim of this experiment was to determine the age at puberty of both ram and ewe lambs of three genotypes: Awassi (A), Charollais x Awassi (CA), and Romanov x Awassi (RA) F 1 crosses. Twenty, six-month old lambs (10 from each sex) from each genotype were used. Ram and ewe lambs were kept in separate groups from the beginning until the end of the experiment. Birth weight and weaning weight were recorded for all animals. Body weights and body condition scores were recorded at monthly intervals between 6.5 and 12 months of age. Blood samples were collected weekly from ewe lambs and fortnightly from ram lambs to monitor progesterone and testosterone profiles, respectively. Semen characteristics and scrotal circumferences (SC) were evaluated fortnightly. Weight at puberty in ewe and ram lambs were not significantly different among the three genotypes and ranged around 35 kg and 42 kg, respectively. In ewe lambs, age at puberty was significantly higher (P< 0.01) in A (280±11.5 d) than in RA (232±11 d) and CA (255±11.5 d). Age at puberty of ram lambs was also significantly different (P < 0.01) among the three genotypes being higher in A (243±5 d) than in CA (223±5 d) and RA (226±5 d) ram lambs. Semen parameters improved with age in all genotypes. The RA ram lambs had greater semen concentration and lower abnormal spermatozoa than the other two genotypes (P< 0.05). Results of the present study indicate that crossing Awassi ewes with either Charollais or Romanov sires tends to improve reproductive characteristics of the F 1 crossbreds through advancing age at puberty in both ram and ewe lambs. (255 ± 11,5 d). Anche nei maschi l'età alla pubertà è risultata significativamente diversa (P < 0,01) tra i

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Section: Puberty In Ewe Lambscontrasting

confidence: 67%

“…Semen samples were collected fortnightly using an electroejaculator as it does not require previous training of ram lambs (Belibasaki and Kouimtzis, 2000). Samples were evaluated for volume (using graduated vials) and mass motility (ranging from 0% = total immobility to 100% = rapid wave motion).…”

Section: Semen Collection and Evaluationmentioning

confidence: 99%

Age at Puberty and Some Biological Parameters of Awassi and its First Crosses with Charollais and Romanov Rams

Kridli

Abdullah

Shaker

et al. 2006

Italian Journal of Animal Science

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“…These results suggest that group penned ram lambs interacting with their pen mates initiate spermatogenesis at an earlier age, than in individually confined ram lambs (Belibassaki and Kouimtzis, 2000). Also Ungerfeld and Lacuesta (2010) reported that spermatogenesis did not develop efficiently in individually confined ram lambs compared with group confined lambs exposed to a ewe in oestrous.…”

Section: Santos Et Almentioning

confidence: 82%

Changes in Sexual Behaviour and Semen Quality Associated with Age and Type of Enclosure of Saint Croix Rams in Different Seasons of the Year

Santos

Sánchez-Dávila

Vázquez-Armijo

et al. 2015

Italian Journal of Animal Science

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The objective of this study was to evaluate sexual behaviour and semen quality of St. Croix ram lambs bred in a semi-desert region. In Experiment 1, 24 yearling rams were assigned to two groups: T1 with 12 males confined for 11 months; T2 with 12 males confined individually for the same period of time. In Experiment 2, 20 four-month-old ram lambs were assigned to two groups of 10 animals each. In each experiment, sexual behaviour and semen quality were evaluated every 2 weeks over 11 months. In Experiment 1, rams that were individually confined showed better sexual activity than lambs confined together (P<0.05), whereas in Experiment 2 ram lambs confined individually only showed shorter time to first mount with ejaculation (P<0.05). In experiment 1, sperm with better progressive motility (P<0.05) was recorded per yearling ram confined individually (63.4±0.2%) in comparison with rams confined together (51.60.1%). In Experiment 2, ram lambs confined together showed better semen quality (P˂0.05). In both trials, an effect of the season was observed on both sexual behaviour and semen quality (P<0.05). In conclusion, this study of St. Croix males showed different sexual behaviours according to age and type of enclosure.

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“…One way to reduce generation interval in a breeding program is to use animals for mating shortly after they reach puberty (Kridli et al, 2007a). Scrotal circumference has been shown to differ among breeds of sheep (Belibasaki and Kouimtzis, 2000), and is larger in crossbred than in purebred lambs. An earlier onset of puberty was achieved in F1 ram lambs and ewe lambs compared to Anim.…”

Section: Discussionmentioning

confidence: 99%

Growth and reproductive traits of purebred and crossbred Romanov lambs in Eastern Anatolia

Korkmaz¹,

Emsen²

2016

Anim Reprod

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The performance of purebred Romanov (R) lambs and crossbred lambs of Romanov and Morkaraman (M) breeding were compared under a semi-intensive production system. The M breed is a fattailed breed native to Eastern Anatolia, Turkey. Analyses were conducted on data from 168 lambs produced from R and M ewes through laparoscopic artificial insemination (LAI) with the semen of pure R and F1 RxM rams. Pure R, F1 (RxM, ½ R), and ¼ R (RxM x M backcross) lambs were produced. The F1 and ¼ R lambs had heavier (P < 0.05) birth weights than R lambs while F1 and R lambs had heavier (P < 0.05) weaning weights than ¼ R lambs. The three groups of lambs differed (P < 0.05) from each other for age of puberty in males and females where with R lambs were the youngest, F1 lambs were intermediate, and ¼ R lambs were the oldest. The percentage of ewe lambs that exhibited estrus within one year of age was higher (P < 0.01) for R (100%) and F1 (67%) lambs than for ¼ R lambs (43%). In conclusion, improvement in growth and early reproductive traits can be obtained from crossbreeding the fat-tailed Morkaraman breed with the Romanov breed.

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Sexual activity and body and testis growth in prepubertal ram lambs of Friesland, Chios, Karagouniki and Serres dairy sheep in Greece

Cited by 40 publications

References 11 publications

Age at Puberty and Some Biological Parameters of Awassi and its First Crosses with Charollais and Romanov Rams

Age at Puberty and Some Biological Parameters of Awassi and its First Crosses with Charollais and Romanov Rams

Changes in Sexual Behaviour and Semen Quality Associated with Age and Type of Enclosure of Saint Croix Rams in Different Seasons of the Year

Growth and reproductive traits of purebred and crossbred Romanov lambs in Eastern Anatolia

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