Short estrous cycles and estrous signs after premature ovulations induced with cloprostenol and gonadotropin-releasing hormone in cyclic dairy cows

Taponen, Juhani; Kulcsár, Margit; Katila, Terttu; Kátai, László; Huszenicza, G.; Rodríguez‐Martínez, H.

doi:10.1016/s0093-691x(02)00957-3

Cited by 28 publications

(16 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, in this study, it is not possible determine if these short cycles and follicular cysts were associated in goats during transition from the non-breeding to the breeding season (de Castro et al, 1999) or induced with the administration of cloprostenol. In other species, such as cows, short oestrous cycles and premature ovulations can be induced with cloprostenol and gonadotropin-releasing hormone (Taponen et al, 2002). Perhaps, following administration of cloprostenol in some does, the rapid onset of pro-oestrus led to the induction of a preovulatory LH surge, but the emerging dominant follicles differed slightly in their degree of maturity with one being mature enough to ovulate and the other not having a sufficient number of LH receptors to ovulate (Garverick et al, 1992).…”

Section: Discussionmentioning

confidence: 99%

Comparison of follicular dynamics and hormone profiles in Boer goats examined during the breeding and non-breeding seasons in the tropics of Queensland, Australia

Nogueira

Cavalieri

Gummow

et al. 2015

Small Ruminant Research

View full text Add to dashboard Cite

Abstract. This study aimed to describe ovarian follicular dynamics in Boer goats (n = 14) during the breeding and non-breeding seasons in the tropics of Queensland. Progesterone profiles and follicular dynamics were compared over a 21-day period in the non-breeding season and one oestrous cycle in the breeding season. Between September and October, 100% of goats were in anoestrus while between April and May they were all undergoing ovulatory cycles. The number of follicular waves during a 3-week period of monitoring was greater during the non-breeding compared to the breeding season (4.8  0.1 vs 4.1  0.1, respectively; P < 0.05), while the number of codominant follicles (5.6  0.3 vs 6.8  0.3, respectively; P < 0.05), growth rate (0.61  0.05 mm/day vs 0.81  0.05 mm/day, respectively; P < 0.05) and the diameter of the largest follicle measured within follicular waves (6.7  0.1 mm vs 7.8  01 mm, respectively; P < 0.05) were less in the non-breeding compared to the breeding season. During the breeding season the interovulatory interval was 19.7  0.2 days. Total number of small follicles (2 to 3 mm) and the total number of follicles ≥3 mm from Days 2 to 14 of the period of examination were greater (P < 0.05) during the non-breeding compared to the breeding season. In the breeding season, 35.7% of cycling goats showed large anovulatory follicles, which persisted and became luteinized. Ovulatory follicles were derived from the fourth follicular wave in 71% of goats. These results have described differences in characteristics of follicular development in the same Boer goats examined during the breeding and non-breeding seasons. In the non-breeding season, the ovaries remained active and follicles continued to grow to reach the equivalent size of preovulatory follicles. Follicular dynamics in the * Corresponding author. +61 4 8894 3333. Email addresses: daniel.nogueira@embrapa.br , daniel.maianogueira@my.jcu.edu.au 2 breeding season was characterised by the development of larger follicles and greater follicular growth rates. Short oestrous cycles and follicular cysts may reduce ovulation rate in Boer goats in the breeding season.

show abstract

Section: Discussionmentioning

confidence: 99%

Comparison of follicular dynamics and hormone profiles in Boer goats examined during the breeding and non-breeding seasons in the tropics of Queensland, Australia

Nogueira

Cavalieri

Gummow

et al. 2015

Small Ruminant Research

View full text Add to dashboard Cite

show abstract

“…Individual progesterone profiles were obtained from serial milk samples assayed by a microplate ELISA method (Nagy et al, 1998) modified for whole milk (Taponen et al, 2002;Huszenicza et al, 2005). Intra-and interassay CVs were < 8% and 10%, respecntra-and interassay CVs were < 8% and 10%, respectively, and sensitivity ranged from 0.17-0.25 nmol/l.…”

Section: Laboratory Proceduresmentioning

confidence: 99%

Interrelationships of growth hormone AluI polymorphism, insulinresistance, milk production and reproductive performance in Holstein-Friesian cos

et al. 2008

View full text Add to dashboard Cite

Healthy multiparous Holstein-Friesian cows (n = 22, parity: 2-4) from a large-scale dairy herd in Hungary were subjected to an intravenous glucose tolerance test 10-15 days after calving. AluI genotype of growth hormone, several plasma metabolites and metabolic hormones were determined, and current and previous lactation yields were recorded. We also used the Revised Quantitative Insulin Sensitivity Check Index (RQUICKI) and its modified version (RQUICKI BHB ) for the estimation of peripheral insulin sensitivity. The majority of cows (n = 18) was leucine homozygous (LL), four were heterozygous (LV) and there were no valine homozygous (VV) animals in the population. Current average milk production was not different between AluI genotypes, but LV cows tended to have higher 305-day previous lactation yields (P = 0.13). AluI polymorphism was not associated with any of the calculated glucose and leptin parameters of the intravenous glucose tolerance test (P > 0.58). Heterozygous cows were prone to higher basal insulin levels (P = 0.064), longer time to reach half of the maximal and basal insulin concentrations (P = 0.035 and P = 0.054, respectively) and larger insulin area under the curve (P = 0.032). Both RQUICKI and RQUICKI BHB estimated decreased insulin sensitivity in LV compared to LL cows (P = 0.055 and P = 0.044, respectively). Higher plasma NEFA and BHB levels accounted for slower glucose disappearance and lower insulin release and insulin clearance rate (P < 0.05). Average yield was inversely related to glucose area under the curve (P = 0.040) and time to reach baseline concentration (P = 0.005). Plasma cortisol lowered glucose clearance rate (P = 0.040) and prolonged time to reach basal levels (P = 0.006). More weight loss was associated with higher glucose peak and prolonged glucose disappearance time (P = 0.055 and P = 0.024, respectively). All cows became cyclic and showed signs of estrus during the study period. There were no differences between leucine homozygous and heterozygous animals in the onset of ovarian activity and in the time of first observed estrus (P > 0.540). We conclude that Holstein-Friesian cows heterozygous for AluI polymorphism of the growth hormone gene may be more likely to develop insulin resistance during early lactation than leucine homozygous cows. Decreased insulin sensitivity could be part of a homeorhetic adaptation process that supports nutrient partioning for the use of the mammary gland and may allow LV cows to reach higher yields throughout lactation.

show abstract

“…Recently, a method using PGF2α combined with GnRH was reported in ewes with a successful lambing rate after natural mating or artificial insemination [1,4]. Treatment with GnRH and PGF 2α is a practical method for controlling ovarian follicular and luteal functions and for increasing the precision of estrus synchronization in cyclic and acyclic postpartum cows and heifers [5][6][7][8]. However, this method is very costly for ewes and it is not a practical method in Japan.…”

mentioning

confidence: 99%

A Comparative Study of Induction of Estrus and Ovulation by Three Different Intravaginal Devices in Ewes during the Non-Breeding Season

Iida

Kobayashi

Kohno

et al. 2004

Journal of Reproduction and Development

View full text Add to dashboard Cite

Abstract. The aim of the present study was to compare three methods of estrus synchronization in ewes during the non-breeding season. Forty-two ewes were randomly grouped for three treatments with different intravaginal devices for 12 days: Group A) CIDR, Group B) Self-made P sponge, Group C) MAP (medroxyprogesterone acetate) cream sponge. Furthermore, all groups were divided into two treatments with (R) or without ram presence to examine the "ram effect". Blood was collected from all treated ewes, and progesterone (P4), estradiol 17-β (E2) and luteinizing hormone (LH) concentrations were measured by enzyme-immnoassay. All ewes showed estrus behavior between Day 0 to 3 after device removal, and the mean onset times of their estrus were 23.0, 33.0 and 21.0 h for Groups AR, BR and CR, respectively. On Day 5 as examined by laparoscopy, the ovulation rates (and number of ovulated ewes) were 1.45 (11/11), 1.25 (12/14) and 1.21 (14/14) for Groups A, B and C, respectively. In Group C, the time to LH surge was significantly (P<0.05) later (32.4 h) than those in Groups A (27.0 h) and B (25.5 h). Ram presence did not affect the number of ovulated ewes, ovulation rate or time to LH surge. The ram introduction group had significantly (P<0.05) lower E2 concentrations during the period from 0 h to 36 h than the groups without ram presence. These results suggest that the self-made P sponge or MAP cream sponge was effective as well as CIDR, and ram introduction was not necessary, for induction of estrus and ovulation during the non-breeding season. Key words: Induction of estrus, Intravaginal device, Non-breeding season, Sheep (J. Reprod. Dev. 50: [63][64][65][66][67][68][69] 2004) strus synchronization is generally applied for reproductive management of sheep flocks worldwide [1], and several methods have been performed with varying degrees of success [2]. The attempted methods are control of daily length and/ o r h o r m o n a l t r e a t m e n t s s u c h a s n a t u r a l p r o g e st e r o n e , s y n t h e t i c p r o g e s t o g e n s ,

show abstract

Short estrous cycles and estrous signs after premature ovulations induced with cloprostenol and gonadotropin-releasing hormone in cyclic dairy cows

Cited by 28 publications

References 28 publications

Comparison of follicular dynamics and hormone profiles in Boer goats examined during the breeding and non-breeding seasons in the tropics of Queensland, Australia

Comparison of follicular dynamics and hormone profiles in Boer goats examined during the breeding and non-breeding seasons in the tropics of Queensland, Australia

Interrelationships of growth hormone AluI polymorphism, insulinresistance, milk production and reproductive performance in Holstein-Friesian cos

A Comparative Study of Induction of Estrus and Ovulation by Three Different Intravaginal Devices in Ewes during the Non-Breeding Season

Contact Info

Product

Resources

About