Relationship of fertility to ovarian follicular waves before breeding in dairy cows

Townson, D.H.; Tsang, Patricia; Butler, Walter; Frajblat, Marcel; Griel, L.C.; Johnson, C. B.; Milvae, R. A.; Niksic, G. M.; Pate, Joy L.

doi:10.2527/2002.8041053x

Cited by 142 publications

(146 citation statements)

References 20 publications

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“…Dominant follicles reached different proportions in the final phase of growth in this study when 2-wave and 3-wave animals were compared. In 2-wave IOIs dominant follicles grew to a larger size than in 3-wave IOIs, which is similar to results published in literature Townson et al, 2002;Wolfenson et al, 2004). We can find this phenomenon described not only in heifers but even in cows (Townson et al, 2002;Celik et al, 2005).…”

Section: Discussionsupporting

confidence: 91%

“…Nevertheless, Price and Carriee (2004) reported a similar percentage (55%) of random wave patterns to ours. This 50% variability can cause the equivocation of representation of 2-or 3-wave patterns in IOIs by some authors who describe 2-wave IOIs Ko et al, 1991;Rajamahendran and Taylor, 1991;Ginther et al, 1996;Wilson et al, 1998a;Roth et al, 2000;Kulick et al, 2001;Townson et al, 2002) as the more frequent pattern of follicular growth than 3-wave IOIs (Ireland, 1987;Fortune et al, 1988;Savio et al, 1988;Sirois and Fortune, 1988).…”

Section: Discussionmentioning

confidence: 99%

“…conception rate after first AI). This could be due to the number of follicular waves per IOI (Townson et al, 2002;Celik et al, 2005), but the results are inconsistent. In lactating dairy cattle, IOIs that consist of at least three waves of follicular growth preceding ovulation and insemination appear to be conducive to improved fertility (Townson et al, 2002;Celik et al, 2005).…”

mentioning

confidence: 94%

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A comparison of the follicular dynamics in heifers of the Czech Fleckvieh and Holstein breeds

Šichtař¹,

Tolman²,

Rajmon³

et al. 2010

CZECH J ANIM SCI

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Differences in follicular development and repeatability of follicular growth pattern among Czech Fleckvieh (n = 20) and Holstein (n = 23) heifers were investigated. Follicular dynamics was evaluated by daily sonographic scanning during three interovulatory intervals. The mean duration of the interovulatory interval was 20.66 ± 0.32 days, no differences between breeds were observed. The proportion of the nonalterna-ting pattern was nearly the same as that of the alternating pattern (54% and 46%, respectively). The majority of IOIs ≤ 21 days were of the 2-wave pattern (71%) whereas only 29% of them were of the 3-wave pattern. Conversely, the majority of IOIs ≥ 22 days were of the 3-wave pattern (84%), whereas only 16% were of the 2-wave pattern. Differences could be observed in the Czech Fleckvieh heifers. Comparing 2-and 3-wave interovulatory intervals, 44.2% of the heifers exhibited 3 waves and 55.8% of the heifers exhibited 2 waves of follicular growth. The ratio of 3-to 2-wave heifers was about the same in the Holstein breed; in Czech Fleckvieh 2-wave cycles slightly dominated (11/12, 8/12; respectively). In Holstein heifers, the first follicular wave occurred 0.92 ± 0.15 days after ovulation in 2-wave interovulatory intervals, and the emergence of the first wave in 2-wave Czech Fleckvieh heifers appeared later (P < 0.05), 1.83 ± 0.3 days after ovulation. The maximal size reached by the dominant follicles in all animals and in the Czech Fleckvieh differed in the first and in the second wave of 2-wave cycles (P < 0.05). In 3-wave interovulatory intervals the dominant follicles in the second wave differed (P < 0.05) from the mean diameters of the first and the third wave in the Czech Fleckvieh. The ovulatory follicles were significantly (P < 0.05) smaller in 2-wave than in 3-wave interovulatory intervals among all animals and between the Holstein and Czech Fleckvieh heifers. In conclusion, we found a similar pattern of ovarian follicular dynamics in Czech Fleckvieh and Holstein heifers kept under identical nutritional and environmental conditions. Whether the significant difference in the emergence of the 1 st follicular wave in 2-wave IOIs between C and H heifers is of real biological significance is ambiguous.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 94%

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A comparison of the follicular dynamics in heifers of the Czech Fleckvieh and Holstein breeds

Šichtař¹,

Tolman²,

Rajmon³

et al. 2010

CZECH J ANIM SCI

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“…AHMAD et al (1997) found that pregnancy rate did not depend on number of follicular waves during oestrous cycle. In contrast to that TOWNSON et al (2002) found that fertility was higher in cattle with three waves per cycle in comparison to cattle with two waves. The later findings seem to be in agreement with data from MIHM et al (1994).…”

Section: Final Follicular Maturation and Ovulationcontrasting

confidence: 71%

Follicular dynamic and ovulation in cattle – a review

Kanitz

2003

Arch. Anim. Breed.

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SummaryA review is given about follicular populations and aspects of follicular development in cattle. Ovaries of cattle contain two different pools of follicles, the non-growing pool and the growing pool. Entry of primordial follicles into the growth phase occurs throughout the reproductive life. Once follicles are recruited to grow, they are destined to undergo atresia or ovulation. Growth of obligatory gonadotropin-dependent follicles occurs in a wave like pattern. The growth waves are characterised by the processes of recruitment, selection and dominance. The known mechanisms responsible for these three processes are discussed.

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“…In lactating dairy cows, conception rate was reduced when the ovulatory follicle originated from the second (58%, n = 64) rather than the third wave (95%, n = 21) of follicular development (reported by Inskeep 2000). Similarly, in a study conducted at five research stations, pregnancy rate was higher in cows with three follicular waves compared to cows with two follicular waves (81 vs. 63%, respectively; n = 32 and 72, respectively; Townson et al 2002). The proportion of animals with two or three waves varies between herds ( Sirois and Fortune 1988;Ginther et al 1989b) but tends to be repeatable for individual animals (Ginther et al 1989a); there is evidence that it varies with nutrition (Murphy et al 1991) and body condition (Burke et al 1995).…”

Section: Number Of Follicular Wavesmentioning

confidence: 91%

Factors affecting embryo survival and strategies to reduce embryonic mortality in cattle

Bilodeau‐Goeseels¹,

Kastelic²

2003

Can. J. Anim. Sci.

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Bilodeau-Goeseels, S. and Kastelic, J. P. 2003. Factors affecting embryo survival and strategies to reduce embryonic mortality in cattle. Can. J. Anim. Sci. 83: 659-671. Embryonic mortality in cattle is the death of the conceptus before Day 42 of pregnancy. Estimates of embryonic mortality varied greatly, ranging from 10 to 40% in first-service cattle to 65% in repeat-breeder cows. This paper reviews endogenous causes of embryonic mortality, including chromosomal abnormalities, inadequate corpus luteum function and the influence of follicular development on fertility. External causes of embryonic mortality, including heat stress and nutrition, are also reviewed; these factors act by modifying the follicular environment (thereby affecting oocyte quality) or by creating a hostile uterine environment. Strategies to reduce embryonic mortality, including good management practices and supplementation with progesterone or interferon-tau, are discussed. From a practical perspective, improved knowledge of the causes of embryonic mortality and regulation of follicular growth and corpus luteum function should result in the development of improved, cost-effective hormonal regimes that effectively synchronize estrus and ovulation and reduce embryonic mortality, thereby benefiting the cattle industry.Key words: Cattle, reproduction, fertility, embryo development, embryo mortality Bilodeau-Goeseels, S. et Kastelic, J. P. 2003. Les facteurs affectant la survie de l'embryon et les stratégies pour réduire la mortalité embryonnaire chez la vache. Can. J. Anim. Sci. 83: 659-671. Chez la vache, la mortalité embryonnaire se définie comme étant la perte de l'embryon avant le Jour 42 de la gestation. Les estimations de la mortalité embryonnaire varient grandement, allant de 10 à 40 % chez les vaches à fertilité normale jusqu'à 65 % chez les vaches à fertilité réduite. L'article que voiçi examine les causes endogènes de la mortalité embryonnaire incluant les anomalies chromosomales, le fonctionnement inadéquat du corpus luteum ainsi que l'influence du développement folliculaire sur la fertilité. Des causes externes telles que le stress thermique et la nutrition sont aussi passées en revue; ces facteurs agissent en modifiant l'environnement folliculaire ce qui conduit à une diminution de la qualité de l'ovocyte; ou en créant un environnement utérin hostile pour l'embryon. Des stratégies pour réduire la mortalité embryonnaire telles que la bonne gestion et la supplémentation avec de la progestérone ou de l'interféron-tau sont aussi discutées. Du point de vue pratique, l'augmentation des connaissances sur les causes de la mortalité embryonnaire ainsi que sur la régulation de la croissance folliculaire et du fonctionnement du corpus luteum permettra le développement de régimes hormonaux améliorés et économiques produisant des hauts niveaux de synchronization de l'estrus et/ou de l'ovulation et qui réduiront la mortalité embryonnaire, ce don't bénéficieront les industries laitières et bovines. Mots clés:Bovin, reproduction, fertilité, dévelo...

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Relationship of fertility to ovarian follicular waves before breeding in dairy cows

Cited by 142 publications

References 20 publications

A comparison of the follicular dynamics in heifers of the Czech Fleckvieh and Holstein breeds

A comparison of the follicular dynamics in heifers of the Czech Fleckvieh and Holstein breeds

Follicular dynamic and ovulation in cattle – a review

Factors affecting embryo survival and strategies to reduce embryonic mortality in cattle

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