Controlled Sheep Breeding: Update 1980-1985

Tj, Robinson

doi:10.1071/bi9880001

Cited by 10 publications

(2 citation statements)

References 14 publications

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“…It is of interest to note that the longer incidence of oestrus after the end of treatment in G3 than G2 was associated with the highest (P<0.05) frequency distribution of does came in oestrus between >42-48 hr in G3 (61.5%) and between <36-42 hr in G2 (54.5%) as show in Table (1). Robinson, (1988) reported that the period of estrus was dependent on LH peak which occurred at 4.5 to 0.7 hr after PMSG injection. Time of onset of estrus and LH release were significantly correlated (r=0.93) with ovulation.…”

Section: Onset Of Oestrusmentioning

confidence: 99%

Oestrous Synchronization and Ovarian Activity of Baladi Goats Treated With Two Hormonal Treatments

Ashour

Badr

Solouma

2009

Journal of Animal and Poultry Production

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This study aimed to evaluate two regimens for oestrus synchronization in Baladi goats during the breeding season in Egypt. Total of 41 Baladi does were divided into three groups: group 1 (control) does were considered as control, group 2 (G2) does were treated with 2 injection of PGF2α 11 days apart, and group 3 (G3) does were treated with daily injection with 25 ml progesterone/doe/day for successive 11 days, and one day before the end of progesterone, with a single dose of 500 I.U. PMSG. Results show that percentage of does exhibited oestrus was 78.57% and 92.85% in G2 and G3, respectively. Onset of oestrus was longer in G3 than in G2 (46.7 vs. 52.2 hr, respectively) Estrus duration was longer (P<0.05) in G3 than in G2 (31.9 vs. 23.5 hr, respectively). Kidding rate was higher (P<0.05) in G3 (85.71%) than in G2 (57.14%) and moderate in the control group (76.92%). Gestation period length was shorter in G3 than G2 and control group (144.6, 147.3 and 147.3 day, respectively). Number of kids born per doe was higher (P<0.05) in G3 than in G2 or control one (2.58, 2.00 and 2.20, respectively). In conclusion, injection of PGF2α at 11 days interval during diestrus in does resulted in lower response to oestrus and fertility rate compared with those injected with progesterone + PMSG which give higher response to oestrus kidding rate and litter size.

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Section: Onset Of Oestrusmentioning

confidence: 99%

Oestrous Synchronization and Ovarian Activity of Baladi Goats Treated With Two Hormonal Treatments

Ashour

Badr

Solouma

2009

Journal of Animal and Poultry Production

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“…2004) and fertility (Gordon 1971; Botha et al. 1975; Robinson 1988) in cyclic ewes; however, it may increase the growth rate and steroidogenic capacity of ovarian antral follicles (Driancourt and Fry 1992; Barrett et al. 2004).…”

Section: Introductionmentioning

confidence: 99%

Ultrasonographic Characteristics of Ovulatory Follicles and Associated Endocrine Changes in Cyclic Ewes Treated with Medroxyprogesterone Acetate (MAP)‐releasing Intravaginal Sponges and Equine Chorionic Gonadotropin (eCG)

Liu

Dai

Hart

et al. 2007

Reprod Domestic Animals

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The aim of this study was to assess the ultrasonographic characteristics of ovulatory follicles in cyclic Western White Face ewes (December) that had received intravaginal sponges containing medroxyprogesterone acetate (MAP; 60 mg) for 12 days, with or without an injection of 500 IU of equine chorionic gonadotropin (eCG) at sponge removal. We hypothesized that quantitative echotextural attributes of the follicles in ewes treated only with MAP would differ from those in MAP/eCG-treated ewes, reflecting the increased antral follicular growth and secretory function under eCG influence. Digital images of ovulatory follicles obtained at 0 and 24 h after MAP sponge removal and at 24 h before ovulation in the eCG-treated (five ewes, 13 follicles) and control (six ewes, 9 follicles) animals, were subjected to computerized analyses. The mean diameter of ovulatory follicles increased (p < 0.001) 24 h after eCG treatment. The mean pixel intensity and heterogeneity of the follicular antrum (p < 0.001), as well as mean pixel intensity of the follicular wall and perifollicular ovarian stroma (p < 0.05), were greater in eCG-treated animals compared with control ewes 24 h after sponge removal and at 24 h before ovulation. Mean serum concentrations of oestradiol-17beta tended to increase (p = 0.06) 24 h after eCG treatment and the eCG-treated ewes exceeded (p < 0.05) control animals in progesterone concentrations from days 9-15 after ovulation. Our results support the hypothesis that large antral follicles in eCG-treated ewes exhibit distinctive echotextural characteristics. Follicular image attributes in eCG-treated ewes appear to be indicative of the changes in follicular morphology and secretory activity caused by the administration of the exogenous gonadotropin, which has both FSH- and LH-like activities.

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Expression of genes for oestrogen and progesterone receptors in the cervix of anoestrous ewes treated with gonadotrophin releasing hormone with or without progesterone priming

Rodrı́guez-Piñón

Tasende

Garófalo

2011

Animal Reproduction Science

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Controlled Sheep Breeding: Update 1980-1985

Abstract: This contribution to the Symposium concerns four topics which have been addressed in our laboratory over the past five years.

Cited by 10 publications

References 14 publications

Oestrous Synchronization and Ovarian Activity of Baladi Goats Treated With Two Hormonal Treatments

Oestrous Synchronization and Ovarian Activity of Baladi Goats Treated With Two Hormonal Treatments

Ultrasonographic Characteristics of Ovulatory Follicles and Associated Endocrine Changes in Cyclic Ewes Treated with Medroxyprogesterone Acetate (MAP)‐releasing Intravaginal Sponges and Equine Chorionic Gonadotropin (eCG)

Expression of genes for oestrogen and progesterone receptors in the cervix of anoestrous ewes treated with gonadotrophin releasing hormone with or without progesterone priming

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