Association of Fertility with Numbers of Antral Follicles within a Follicular Wave During the Oestrous Cycle in Beef Cattle

Starbuck-Clemmer, M.J.; Hernández–Fonseca, Hugo; Ahmad, Nasim; Seidel, G.E.; Inskeep, E. K.

doi:10.1111/j.1439-0531.2006.00786.x

Cited by 14 publications

(9 citation statements)

References 31 publications

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“…Positive partial correlations were also found between ovarian size and prebreeding BW, weight:height ratio, or ADG; thus, the association between AFC and body size and growth performance may be the consequence of a treatment or genetic effect on body size, with AFC being increased because of positive relationships between ovarian size and body size and between ovarian size and AFC. In contrast with recently reported decreased fertility in beef ) and dairy (Mossa et al, 2012) cows and heifers with low (≤15 follicles) vs. high (≥25 follicles) AFC, pregnancy rate did not differ between low-and high-AFC beef heifers in the present study or in a study reported by Starbuck-Clemmer et al (2007). Cushman et al (2009) reported that AFC increases with age, reaching a maximum at about 5 yr and declining thereafter.…”

Section: Discussioncontrasting

confidence: 55%

Effect of postweaning diet on ovarian development and fertility in replacement beef heifers1

Eborn

Cushman

Echternkamp

2013

Journal of Animal Science

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Programs for developing replacement heifers are designed for heifers to calve at 2 yr of age and to extend their stayability in the herd and minimize feed cost. The experimental objective was to determine whether developing prepubertal heifers on less dietary energy and to a BW of 55% rather than 65% of mature BW at 14 mo of age would compromise ovarian development and reduce fertility. In a 3-yr study, 8-mo-old Angus (n = 60/yr) and composite MARC II (n = 60/yr) heifers were assigned equally by age, BW, and breed to receive either a low (LG) or high (HG) BW gain diet fed to achieve an ADG of either 0.45 or 0.8 kg/d from 8 to 15 mo of age, including the first 21 d of breeding, and then transferred to pasture. At 14 mo, heifers were housed with fertile bulls for 47 d. Estrus was monitored for 21 d. Within 12 h after detection of estrus, ovarian length and height, preovulatory follicle diam., and antral follicle count (AFC) were measured by transrectal ultrasonography. Corpus luteum (CL) volume and plasma progesterone concentration were measured 5 to 15 d after estrus. Data were analyzed by ANOVA with treatment, breed, and year and their 2-way interactions as independent variables. At breeding, HG heifers were heavier than LG heifers (419.9 vs.361.8 ± 7.5 kg; P < 0.01); ADG for the treatment period was 0.79 vs. 0.47 ± 0.04 kg/d (P < 0.01), respectively. In 2010 and 2011, 97.2% of heifers were cyclic by 21 d of breeding. Size of the ovary, preovulatory follicle, CL, and AFC did not differ between HG and LG, but preovulatory follicle diam. and ovarian length were greater (P ≤ 0.05) for MARC II vs. Angus heifers. Progesterone concentrations were less for LG vs. HG heifers (P ≤ 0.02), whereas CL volume was not affected by treatment or breed but was correlated positively with preovulatory follicle size (P < 0.01). Total AFC ranged from 5 to 49 and was correlated positively with ovarian volume but was not associated with fertility. A greater proportion of HG vs.LG heifers conceived within the first 21 d of the breeding period (64.4% vs. 49.2% ± 3.8%, respectively; P < 0.01), but overall pregnancy rate was not affected by treatment (83.0% vs. 77.7% ± 3.1%, respectively; P > 0.10). Pregnancy rate was 10% less (P < 0.01) for Angus vs. MARC II heifers. Developing beef heifers at a lesser ADG to a lighter BW (55% vs. 64% of mature BW) at breeding did not influence postweaning ovarian development or AFC or compromise pregnancy rate during the 47-d breeding period.

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Section: Discussioncontrasting

confidence: 55%

Effect of postweaning diet on ovarian development and fertility in replacement beef heifers1

Eborn

Cushman

Echternkamp

2013

Journal of Animal Science

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“…A novel finding in this study was that heifers that calved in the first 21 d of their first calving season had greater numbers of antral follicles detectable by ultrasonography at 14 months of age. Antral follicle count has been reported as an indicator of fertility in heifers and cows in a numbers of studies (Cushman et al, 2009;Mossa et al, 2012;Tessaro et al, 2011); however, there have also been studies where antral follicle count did not reflect fertility in cattle (Snelling et al, 2012;Starbuck-Clemmer et al, 2007). Mossa et al (2012) reported a tendency for dairy cows with low follicle numbers to have an increased number of services per conception and lower pregnancy rates in a seasonal production system.…”

Section: Traitmentioning

confidence: 99%

The impact of cow nutrient status during the second and third trimesters on age at puberty, antral follicle count, and fertility of daughters

Cushman¹,

McNeel²,

Freetly³

2014

Livestock Science

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a b s t r a c tFluctuating feed resources to beef cows across the production cycle is a proven method for decreasing input costs; however, limiting nutrients during late gestation have been demonstrated to decrease ovarian follicle numbers in female offspring in some studies. We hypothesize that limiting nutrients to mature ( Z3 yr) crossbred beef cows during the second and third trimesters would result in daughters that would have decreased follicle numbers detectable by ultrasonography as yearlings. Over four breeding seasons, pregnant beef cows (n ¼ 397) were assigned to either Low (L), Moderate (M) or High (H) nutrient intake during the second or third trimester, resulting in four dietary treatment groups (L-H, L-L, M-H, and M-M). Heifers (n ¼416) born to these cows were weighed at weaning and moved to a dry lot where they were monitored for behavioral estrus with the aid of heat detection patches. Two weeks before their first breeding season, heifers were submitted for ultrasonographic examination of their ovaries to determine antral follicle numbers. Heifers were placed with bulls for 60 d and pregnancy status was determined 45 d after the bulls were removed. Growth and reproductive traits were analyzed using the MIXED Procedure of SAS with maternal diet and year as fixed effects. Maternal dietary intake did not affect heifer growth rates, age at puberty, or antral follicle counts (PZ 0.40). However, an increased proportion of the heifers born to dams fed a high nutrient diet during the third trimester (L-H or M-H) calved in the first 21 d of their first calving season (P¼ 0.004). Antral follicle counts detectable by ultrasonography at yearling pre-breeding examination were greater in heifers that calved during the first 21 d of their first calving season (P ¼ 0.02); however, these heifers did not differ in age at puberty (P ¼ 0.60). From this study, we conclude that: (1) limiting nutrient intake during late gestation in mature ( Z3 yr) beef cows does not influence the ovarian reserve or reproductive performance of daughters; (2) increasing maternal nutrient intake during ☆ Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of names by the USDA implies no approval of the product to the exclusion of others that may also be suitable.n Corresponding author. This article is a U.S. government work, and is not subject to copyright in the United States.the third trimester can improve the first service conception rates of daughters; and (3) pre-breeding ultrasonography to determine antral follicle counts is a good indicator of fertility for choosing replacement heifers. Published by Elsevier B.V.

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“…Contraditoriamente, STARBUCK-CLEMMER et al (2007), trabalhando com fêmeas taurinas de corte, demonstraram que a categoria animal influenciou na quantidade de folículos ≥4mm de diâmetro presentes nos ovários, verificando uma menor CFA nas vacas paridas em relação as novilhas. Os autores justificaram estes achados pela idade das vacas utilizadas na pesquisa, entretanto, no presente estudo, a maioria dos animais apresentava idades inferiores a 10 anos (BURNS et al, 2005).…”

Section: Resultsunclassified

“…A partir do procedimento de regressão logística, também não observou-se aumento na probabilidade de concepção com o acréscimo no número de folículos (P>0,27). De forma similar, STARBUCK-CLEMMER et al (2007) também não demonstram variação entre a taxa de concepção e a quantidade de folículos antrais em fêmeas taurinas Tabela 1 -Comparação da contagem de folículos antrais (CFA) em fêmeas Nelores de diferentes grupos de categorias animais, dias pós-parto, diâmetro ovariano, presença de corpo lúteo eescore de condição corporal (ECC),submetidas a um protocolo de inseminação artificial em tempo fixo (IATF).…”

Section: Resultsunclassified

Contagem de folículos antrais em fêmeas Nelore submetidas a inseminação artificial em tempo fixo

et al. 2015

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Association of Fertility with Numbers of Antral Follicles within a Follicular Wave During the Oestrous Cycle in Beef Cattle

Cited by 14 publications

References 31 publications

Effect of postweaning diet on ovarian development and fertility in replacement beef heifers1

Effect of postweaning diet on ovarian development and fertility in replacement beef heifers1

The impact of cow nutrient status during the second and third trimesters on age at puberty, antral follicle count, and fertility of daughters

Contagem de folículos antrais em fêmeas Nelore submetidas a inseminação artificial em tempo fixo

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