The Effect of Aging on the Ovarian Follicular Growth in Laying Hens

Zakaria, A. H.; Miyaki, Takashi; Imai, Kiyoshi

doi:10.3382/ps.0620670

Cited by 69 publications

(43 citation statements)

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“…In comparison to the RBC3 line hens, the Egg line hens had a decrease in intrasequence LH surge intervals, a decrease in the incidence of blind LH surges, and a decrease in the incidence of LH surge intervals of Ͼ33 h (intersequence intervals), resulting in a higher rate of egg production in the Egg line hens. Several factors may contribute to poorer egg production of laying hens late in the reproductive period, including 1) an increase in intrasequence LH surge intervals, resulting in longer intervals between intrasequence ovipositions [20]; 2) an increase in the incidence of intersequence intervals of Ͼ33 h between clutches of eggs [2], resulting in a decrease in clutch size [21]; 3) an increase in follicular atresia, resulting in a lower rate of follicular maturation and number of follicles available for ovulation [22,23]; 4) a loss of synchronization of ovulation and oviposition [24][25][26], resulting in an increase in the number of defective eggs late in the reproductive period, and 5) abnormal secretion of P 4 , associated with a blockage of LH surge secretion and ovipositions [12].…”

Section: Introductionmentioning

confidence: 99%

Interval Between Preovulatory Surges of Luteinizing Hormone Increases Late in the Reproductive Period in Turkey Hens1

Liu¹,

Long²,

Bacon³

2002

Biology of Reproduction

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In turkey hens, the egg production rate is relatively high early during a reproductive period, but declines as the period progresses. Among lines with different egg production potential, the interval between preovulatory surges of LH is the primary determinant of the egg production rate. The main objective of this study was to determine whether the decline in egg production rate late during an egg production period is also associated with a difference in the interval between LH preovulatory surges. A group of photosensitive turkey hens (Early) were photostimulated with continuous light (24L:0D) at 40 wk of age to induce egg laying, and serial blood samples were collected after about 3 wk of egg production. A second group of hens (Late) were housed in floor pens and photostimulated with 14L:10D at 40 wk of age for a normal 36-wk reproduction period and were then switched to 24L:0D lighting for 2 wk before collection of serial blood samples. Continuous light photostimulation was used for at least 2 wk before and during serial blood sampling to avoid potential masking effects of diurnal lighting on the interval between LH surges. The Early (n = 12) and Late (n = 16) hens were cannulated 3 days before being serially bled hourly for 10 days. The mean interval between preovulatory surges of LH was shorter in the Early hens than in the Late hens (26.1 +/- 2.5 h and 34.7 +/- 3.9 h, respectively). The intra-hen LH surge interval coefficient of variation was lower in the Early hens than in the Late hens (7.2% and 18.6%, respectively). The inter-hen LH surge interval coefficient of variation was similar in the Early and Late hens (9.5% and 11.2%, respectively). The incidence of blind surges of LH (those not retrospectively associated with ovipositions) was not different between Early and Late laying hens (8.4% +/- 15.2% and 7.3% +/- 14.6%, respectively). In conclusion, in turkey hens, longer intervals and greater intra-hen variation between LH surges were associated with a poorer rate of egg production late in the reproductive period relative to early in the reproductive period.

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Section: Introductionmentioning

confidence: 99%

Interval Between Preovulatory Surges of Luteinizing Hormone Increases Late in the Reproductive Period in Turkey Hens1

Liu¹,

Long²,

Bacon³

2002

Biology of Reproduction

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“…A ovulação ocorre a cada 24 ou 25 horas em matrizes pesadas, logo que atingem a maturidade sexual, porém à medida que as matrizes envelhecem o intervalo entre ovulações aumenta para 26 a 27 horas ou mais, entretanto a mesma quantidade de constituintes da gema, proveniente da síntese hepática é depositada em um número cada vez menor de folículos (ZAKARIA; MIYAKI; IMAI, 1983;VIEIRA, 2000;ROCHA et al, 2008). Assim, ovos produzidos, por matrizes mais velhas, apresentam gemas maiores, proporcionalmente ao peso total do ovo e consequentemente ao tamanho do pinto (MAIORKA et al, 2000).…”

Section: Introductionunclassified

Influência da idade da matriz sobre a biometria de órgãos e a morfometria da mucosa do intestino delgado dos pintos à eclosão

et al. 2014

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ResumoO experimento foi conduzido com o objetivo de avaliar o efeito de diferentes idades de matrizes sobre a biometria de órgãos e a morfometria intestinal de pintos de corte à eclosão. Foram incubados 200 ovos provenientes de matrizes pesadas da linhagem comercial Ross 308, com as idades de 32, 40, 48, 56 e 64 semanas. À eclosão 20 pintinhos de cada idade de matriz foram pesados individualmente e sacrificados para avaliação do peso do peito, bolsa cloacal, saco da gema e intestino delgado e do comprimento do intestino delgado. O segmento do duodeno foi coletado para mensuração da altura de vilo e da profundidade de cripta. Houve efeito linear positivo da idade da matriz (p<0,05) sobre o peso vivo, peso absoluto e relativo do saco da gema, peso absoluto da bolsa cloacal e peso absoluto e relativo do peito. Para o peso absoluto, peso relativo do intestino delgado observou-se efeito quadrático da idade da matriz (p<0,05), sendo o melhor desenvolvimento do intestino em pintos provenientes de matrizes entre 40 e 50 semanas. O peso do pinto apresentou correlação positiva com o peso do saco da gema, bolsa cloacal e peito (p<0,05). Para vilo e cripta obteve-se um efeito significativo da idade das matrizes (p<0,05) sobre a profundidade das criptas, cujo comportamento foi linear decrescente e inverso à idade das matrizes enquanto a relação vilo:cripta, apresentou comportamento linear crescente (p<0,05) de acordo com a idade das matrizes. Conclui-se que a idade da matriz tem influência na biometria dos órgãos e na morfometria da mucosa do intestino delgado de pintos de corte à eclosão. Palavras-chave: Altura de vilo, peso de órgãos, frango de corte, saco da gema AbstractThe objective of the conducted experiment was the evaluation of effect of multiple age breeders on the organs biometry and the intestinal morphometry of chicks at hatching. There were incubated 200 eggs provided from Ross 308 breeders at the ages of 32, 40, 48, 56 and 64 weeks. At hatching, 20 chicks of each breeder age were individually weighted and sacrificed in order to evaluate breast, cloacal bursa, yolk sack and small intestine weight, besides the small intestine length. The duodenum portion was collected in order to measure the villus height and the crypt depth. There were a positive linear effect of the breeder age (p<0,05) on the live weight, absolute and relative yolk sack weight, cloacal bursa

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“…From these results, the follicular growth period in Japanese quail is considered to be commonly for 5 to 6 days under 14L/10D. The growth period in the quail was quite shorter than that in the laying hen ZAKARIA et al, 1983). On the other hand, the mean growth period under LL was significantly longer than that under 14L/ 10D.…”

mentioning

confidence: 82%

Egg Laying and Ovarian Follicular Growth in Japanese Quail under Continuous Lighting.

1997

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The Effect of Aging on the Ovarian Follicular Growth in Laying Hens

Cited by 69 publications

References 5 publications

Interval Between Preovulatory Surges of Luteinizing Hormone Increases Late in the Reproductive Period in Turkey Hens1

Interval Between Preovulatory Surges of Luteinizing Hormone Increases Late in the Reproductive Period in Turkey Hens1

Influência da idade da matriz sobre a biometria de órgãos e a morfometria da mucosa do intestino delgado dos pintos à eclosão

Egg Laying and Ovarian Follicular Growth in Japanese Quail under Continuous Lighting.

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