Follicular growth and atresia in the ovaries of hens (Gallus domesticus) with diminished egg production rates

Waddington, D.; Perry, Margaret M.; Gilbert, A. B.; Hardie, Marion A.

doi:10.1530/jrf.0.0740399

Cited by 45 publications

(23 citation statements)

References 16 publications

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“…In laying chickens, a decrease in follicular maturation rate and egg production rate late in an egg production period may be caused by a higher incidence of follicular atresia [32][33][34]. However, the present results showed that higher incidences of follicular atresia were not detected late in the reproductive period, suggesting that this phenomenon does not contribute to the decrease in egg production late in the egg production period in the Egg line of turkey hens.…”

Section: Discussioncontrasting

confidence: 63%

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: Discussioncontrasting

confidence: 63%

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 eggtype chickens, the number of large follicles in an ovary is related to the pattern of laying and birds laying in long sequences tend to have more than those laying in short sequences (Gilbert, 1971). Waddington et al (1985) also noted that the decrease in egg production in chickens was accompanied by a corresponding reduction in average sequence length.…”

Section: Discussionmentioning

confidence: 90%

Effect of Feed Allowance During Rearing and Breeding on Female Broiler Breeders.

et al. 1992

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The influence of feed allowance during rearing (4 to 18 wk) and breeding (18 to 62 wk) on ovarian morphology and egg production was examined. During rearing, beginning at 4 wk of age, 400 Indian River pullets that had been full-fed from 1 day of age either continued to be full-fed (F, n = 200) or were feed restricted (R, n = 200), following commercial practice. At 18 wk of age, 100 birds (within +15% of the mean BW) in each of F and R rearing groups were further assigned to be full-fed (n = 50) or feed restricted (n = 50) during breeding. Thus, based on feed allowance during rearing and breeding, four treatment groups were formed (FF, FR, RF, and RR). Feed restriction during rearing significantly delayed oviduct development and age at sexual maturity (age at first egg). Compared with feed restriction during both rearing and breeding (RR), ad libitum feeding beginning at 18 wk of age (RF) significantly increased the weight of the ovary and the number of large follicles at sexual maturity but did not significantly affect the age at sexual maturity. Feed restriction during rearing, breeding, or both significantly reduced the incidence of erratic ovipositions, defective eggs, and multiple ovulations. The incidence of erratic ovipositions was positively correlated (r = .692, P less than or equal to .001) with the laying of soft-shelled and shell-less eggs and negatively correlated (r = -.508, P less than or equal to .001) with the production of settable eggs to 62 wk of age. Compared with ad libitum feeding, controlled feeding during breeding significantly improved both settable and total egg production. Among the four feeding regimens, Treatment RR resulted in the highest fertility and hatchability.

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“…The effects of ageing on this loss is not clear. Reductions in egg laying towards the end of a laying year have been associated with the incidence of follicular atresia (Williams and Sharp, 1978a;Waddington et al, 1985). A further decrease in egg output could be due to a condition known as erratic oviposition and defective egg syndrome (EODES) (van Middlekoop, 1972).…”

Section: Introductionmentioning

confidence: 99%

Reproductive senescence in domestic fowl: Effects on egg production, sequence length and inter‐sequence pause length

Robinson

Hardin

Robblee

1990

British Poultry Science

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1. Age-related changes in egg production, oviposition sequence length and inter-sequence pause length were studied by analysis of oviposition records of 50 individually-caged broiler breeders from 24 to 62 weeks of age. 2. The 44 surviving hens exhibited a production profile characteristic of broiler breeders (184 eggs per hen), with a peak mean sequence length of 19 eggs at 32 weeks of age. Inter-sequence pause length was maximum (1.6 d) at 54 weeks of age. Overall, the hens averaged 48 sequences, with a mean sequence length of 4.1 d. 3. Most hens had a single characteristically long sequence about the time of peak egg production (average: 24.3 d). The term 'prime' is suggested to denote this sequence. 4. Sorting the hens into groups on the basis of total egg output (upper and lower 50% and upper and lower 25%) indicated that high producing hens (upper 50% and 25%) had a very long prime sequence early in lay, and had few inter-sequence pauses of greater than 1 d duration. The converse was true for low producers (lower 50% and 25%). 5. The length of the prime sequence may be a good indicator of reproductive efficiency of hens later in life.

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Follicular growth and atresia in the ovaries of hens (Gallus domesticus) with diminished egg production rates

Cited by 45 publications

References 16 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

Effect of Feed Allowance During Rearing and Breeding on Female Broiler Breeders.

Reproductive senescence in domestic fowl: Effects on egg production, sequence length and inter‐sequence pause length

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