An ultrasonographic study of luteal function in breeds of sheep with different ovulation rates

Bartlewski, Pawel M.; Beard, A.P.; Rawlings, N.C.

doi:10.1016/s0093-691x(99)00114-4

Cited by 68 publications

(50 citation statements)

References 29 publications

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“…In spite of their low number per ovary, the less efficient detection of follicles ≥8 mm could have been due to the juxtaposition of some of those follicles. These high correlations, as well as the good estimation of the number of follicles with ≥3 mm diameter by RTU are necessary, because recent follicular dynamic studies in goats (Ginther and Kot, 1994, de Castro et al, 1999and Medan et al, 2003 and in ewes (Ginther et al, 1995, Bartlewski et al, 1999, Evans et al, 2000 are performed, basically, by the identification and growth of follicles with more than 3 mm diameter.…”

Section: Discussionmentioning

confidence: 99%

“…Ultrasonographic characteristics of CL are very similar in cows (Omran et al, 1988;Boyd, 1995), ewes (Bartlewski et al, 1999) and goats (de Castro et al, 1999 andMedan et al, 2003) and are related to the development stage (Omran et al, 1988;Boyd, 1995;Veronesi et al, 2002). In dairy cows, the ultrasonographic appearance of luteinic tissue is a highly reliable method for the assessment of mid-cycle corpus luteum (Veronesi et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…The ovulation day can be validated by RTU through the visualization of, at least, one corpora lutea, just after the 3rd day both in ewes (Bartlewski et al, 1999) and goats (Medan et al, 2003). However, the incidence of a short life-span corpus luteum in these species (Camp et al, 1983, Bartlewski et al, 1999, lead Duggavathi et al (2003) to test the possibility that validation should be done through the visualization of the corpus haemorrhagicum from 12-24 to 60-72 h after the ewe ovulation.…”

Section: Discussionmentioning

confidence: 99%

“…However, the incidence of a short life-span corpus luteum in these species (Camp et al, 1983, Bartlewski et al, 1999, lead Duggavathi et al (2003) to test the possibility that validation should be done through the visualization of the corpus haemorrhagicum from 12-24 to 60-72 h after the ewe ovulation.…”

Section: Discussionmentioning

confidence: 99%

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Morphometry of ovarian structures by transrectal ultrasonography in Serrana goats

Simões

Potes

Azevedo

et al. 2005

Animal Reproduction Science

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The accuracy of transrectal real-time ultrasonography (RTU) scanning technique to detect ovarian structures (follicles and corpus luteum) of Serrana goats was compared to the data obtained by observation of ovarian sequential slices. This slicing technique (SLI) was considered as reference method. The laparoscopy and laparotomy techniques were also used for corpora lutea identification. For this purpose the ovaries of 14 females were observed, 7-8 days after ovulation, by transrectal ultrasonography followed by laparoscopic examination. Then ovaries were removed and studied by slicing. In the sliced sections of each ovary (n = 28), follicles and corpus luteum (CL) were identified and counted. CL and follicular diameters were measured using a millimetre scale.The total number of follicles, counted by RTU, was significantly lower than that observed by SLI (P < 0.01). This difference was mainly due to the under estimation of <2 mm follicles category. The correlation coefficient between category data obtained by RTU and SLI methods for the number of follicles ≥3 mm was high (r 2 = 0.95, P < 0.001), which highlights the use of UTR as a potential methodology to study the follicular dynamic of goats.There were no significant differences (P > 0.05) between the average number (mean ± S.D.) of corpus luteum identified per ovary by RTU (0.71 ± 0.75), laparoscopy (0.58 ± 0.71), laparotomy (0.67 ± 0.76) or SLI (0.83 ± 0.76) methods. The accuracy for the identification of ovulation, validated by CL detection on D7-D8 by SLI (100%), was 91.7%, 87.5% and 83.3% by RTU, laparotomy and laparoscopy, respectively. The negative predictive value of RTU, laparotomy and * Corresponding author. E-mail address: jsimoes@utad.pt (J. Simões). Simões et al. / Animal Reproduction Science 85 (2005) [263][264][265][266][267][268][269][270][271][272][273] laparoscopy to verify the absence of a CL in the ovary was 81.8%, 75.0% and 69.2%, respectively. The specificity of all three methods for the CL identification was 100%. No significant differences (P > 0.05) were found in the probability to detect the exact number of CL (0, 1 or 2) counted in each ovary between the RTU (87.5%), laparotomy (83.3%) and laparoscopy (75.0%) methods when compared with the reference method. 0378-The diameter of spherical CL could be estimated with reliability (r 2 = 0.86; P < 0.001). The real-time ultrasonographic scanning proved to be a highly accurate method for detection and measurement of several categories of follicles and CL size in Serrana goats. The results of the present study show that laparoscopy and RTU are similarly reliable techniques for CL detection. However, the RTU represents a non-traumatic technique with advantages to animal welfare both in experimental and reproductive evaluation of the size of ovarian structures.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Morphometry of ovarian structures by transrectal ultrasonography in Serrana goats

Simões

Potes

Azevedo

et al. 2005

Animal Reproduction Science

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“…Another relevant finding from this study was that the administration of luteal levels of P4, which may vary between 3.2 and 11.4 nmol/l in ewes (Bartlewski et al, 1999), did not affect milk yield or composition. This confirms and expands results from a study by Smith and Inskeep (1970), who reported that treatment with progestagens (medroxiprogesterone and flurogestone acetate) had no effect on ewes' milk production.…”

Section: Discussionmentioning

confidence: 54%

Progesterone administration reduces the behavioural and physiological responses of ewes to abrupt weaning of lambs

Freitas‐de‐Melo

Banchero

Hötzel

et al. 2013

Animal

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Abrupt weaning, a usual management in sheep productive systems, may provoke behavioural and physiological responses indicative of stress in ewes and lambs. Progesterone (P4) has anxiolytic and sedative effects through the union of its metabolites that contain 3a-hydroxyl group to the g-aminobutyricacid A receptor. Our first aim was to determine whether P4 administration reduces the behavioural and physiological responses of ewes to abrupt weaning of lambs. A complementary aim was to determine whether P4 treatment affects the milk yield and composition of ewes, and the BW of their lambs. In experiment 1, seven ewes received P4 treatment for 32 days (group E1-P4), and eight ewes remained as an untreated control group (group E1-C). BW of the lambs was recorded during P4 treatment. Lambs were weaned at 59 days (Day 0 5 weaning). The main behaviours of the ewes before and after weaning were recorded using 10 min scan sampling. The ewes' serum total protein, albumin and globulin concentrations were measured before and after weaning of the lambs. In experiment 2, milk yield and composition were determined in two different groups of six ewes treated with P4 (group E2-P4) for 16 days and in five untreated controls (group E2-C). The BW of lambs increased with time ( P 5 0.001) in both groups and did not differ. The percentage of observations in which the ewes were seen pacing on Day 0 was greater in the E1-C group than in the E1-P4 group ( P 5 0.0007). Similarly, the percentage of observations in which the ewes were recorded vocalizing on Day 0 was greater in the E1-C group than in the E1-P4 group ( P 5 0.04). The percentage of observations in which E1-C ewes were recorded lying did not change from Days 0 to 1; however, it increased in E1-P4 ewes. Total serum protein concentration did not change in E1-P4 ewes from Days 0 to 3, although a decrease was seen in E1-C ewes ( P 5 0.04). Serum globulin concentration was greater in E1-P4 ewes on Day 3 than in E1-C ewes (P 5 0.0008). In experiment 2, there were no differences between E2-P4 and E2-C ewes in terms of milk yield, protein, fat and lactose content. Progesterone administration reduced the behavioural and physiological responses of ewes to abrupt weaning of lambs, and this effect was not mediated by changes in milk yield and composition, or by lambs' BW.

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Ultrasonography in Small Ruminant Reproduction

Meinecke-Tillmann¹,

Meinecke²

2007

Comparative Reproductive Biology

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An ultrasonographic study of luteal function in breeds of sheep with different ovulation rates

Cited by 68 publications

References 29 publications

Morphometry of ovarian structures by transrectal ultrasonography in Serrana goats

Morphometry of ovarian structures by transrectal ultrasonography in Serrana goats

Progesterone administration reduces the behavioural and physiological responses of ewes to abrupt weaning of lambs

Ultrasonography in Small Ruminant Reproduction

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