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

Robinson, F. E.; Hardin, R. T.; Robblee, A. R.

doi:10.1080/00071669008417318

Cited by 62 publications

(40 citation statements)

References 11 publications

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“…Total lag is a measure of the proportion of the day used for egg laying and can be regarded as an indication of the length of the open period for ovulation (Fraps, 1970). A shortening of the duration of the open period may reduce the ovulation rate and hence the rate of oviposition (Robinson et al, 1990). The differences in total lag found between genotypes are then in good agreement with and probably contributed to the observed differences in laying rates.…”

Section: Discussionsupporting

confidence: 69%

Oviposition and egg quality traits of dwarf and naked neck layers

Garces¹,

Casey²

2003

SA J. An. Sci.

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Oviposition and egg quality traits were studied in dwarf and naked neck layers in Maputo (Mozambique) during a 28-d period at 35 weeks of age. Birds were caged individually in a laying house with natural light and ventilation. Average daylight length during the study was 11.2 hr and minimum and maximum temperature was 19.6 °C and 30.1 °C, respectively. The main results show that the sex-linked dwarfing gene (dw) increased the mean interval and time of oviposition, and reduced the sequence length and rate of lay. A bimodal distribution of oviposition intervals was observed in the dwarf population. No meaningful effect of the naked neck (Na) gene could be seen on oviposition traits. The dw gene also reduced the egg and components weight as well as the height of the albumen. The Na gene was associated with increased yolk weight and reduced albumen height.

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Section: Discussionsupporting

confidence: 69%

Oviposition and egg quality traits of dwarf and naked neck layers

Garces¹,

Casey²

2003

SA J. An. Sci.

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“…Under the parameters of this study, hens with a long prime sequence length were not prone to having reduced persistency of lay. Prime sequence length was correlated with both total egg production (r = 0.485) and to settable egg production (r = 0.478), concurring with previous research by Robinson et al (1990), which indicated a correlation r = 0.399 between prime sequence length and total egg production. The relationship between prime sequence length and egg production can be a useful criteria for the early selection of hens with high egg production potential.…”

Section: Sequence Lengthsupporting

confidence: 78%

“…Pauses in egg production were averaged into the average weekly sequence length as 0s. The prime sequence was defined as the longest egg sequence around the time of peak production (Robinson et al 1990). …”

Section: Laying Recordsmentioning

confidence: 99%

Effects of altering growth curve and age at photostimulation in female broiler breeders. 2. Egg production parameters

Renema¹,

Robinson²,

Goerzen³

et al. 2001

Can. J. Anim. Sci.

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2001. Effects of altering growth curve and age at photo-stimulation in female broiler breeders. 2. Egg production parameters. Can. J. Anim. Sci. 81: 477-486. An experiment was conducted to evaluate the effect of differences in growth curve and age at photostimulation on egg production parameters and carcass traits at 61 wk of age in broiler breeder hens. Pullets were grown on one of three growth curves: STD (standard), LOW (150 g lighter than STD) and HIGH (150 g heavier than STD), and photostimulated at either 19 wk of age (19WK) or 21 wk of age (21WK). The egg production and BW of 36 birds per interaction were individually monitored from photostimulation to 61 wk of age. Individual, daily egg production records were analyzed for total, settable, and defective egg production, rate of production, sequence length, and egg weight. Eggs were incubated for determination of fertility, hatchability, and embryonic mortality parameters. All birds remaining at 61 wk of age were processed for determination of carcass and reproductive morphology. Unless otherwise stated, all significance was assessed at the P < 0.05 level. Earlier photostimulation age advanced age at sexual maturity, but reduced the first egg weight. Weight of the first egg did not differ among growth curves. Settable egg production to 61 wk was not affected by growth curve, with settable egg production ranging from 157.5 eggs in STD birds to 164.1 eggs in HIGH birds. The HIGH birds produced more double-yolked eggs than LOW birds. Photostimulation age did not affect egg production. Eggs of the LOW birds underwent more embryonic loss during 1 to 7 d of incubation than either STD or HIGH eggs. At 61 wk of age, the shank length of birds on the LOW profile was less than that of the STD birds or the HIGH birds. Abdominal fatpad as a percentage of BW differed among growth curve treatments, comprising 4.46% (LOW), 5.06% (STD), and 5.69% (HIGH) of hen BW. Ovary weight of HIGH birds (44.7 g) was higher than that of LOW (39.2 g) or STD birds (37.7 g), but contained a similar number of large yellow follicles. The proportion of large yellow follicles in multiple follicle sets at 61 wk was correlated with unsettable egg number (r = 0.265), and was negatively associated with chick number (r =-0.269). There was no production advantage to early photostimulation, and egg and chick production were not negatively affected by a moderate raising or lowering of the growth curve.. 2001. Modification de la courbe de croissance et de l'âge à la photostimulation et leur incidence sur les pondeuses de poulets de chair : 2. Paramètres de ponte. Can. J. Anim. Sci. 81: 477-486. Les auteurs ont effectué une expérience pour déterminer quels effets une modification de la courbe de croissance et de l'âge à la photostimulation aurait sur les paramètres de ponte et la conformation de la carcasse des pondeuses d'oeufs d'incubation âgées de 61 semaines. Les poulettes ont été réparties en trois groupes de courbe de croissance différente-soit STD (standard), FAIBLE (150 g de moins que STD) et ÉL...

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“…However, It is evident from these results that delalJd sexual maturity results in-longer prime sequences' and iherefore fewer sequences and fewer pause days' Prime ,.qu.n"" length is known to be correlated with total egg ""ipr, i" broller breeders (Robinson et al'.1990) …”

Section: Ggg)mentioning

confidence: 96%

Effects of age at photostimulation on reproductive efficiency and carcass characteristics. 2. Egg-type hens

Robinson¹,

Wautier²,

Hardin³

et al. 1996

Can. J. Anim. Sci.

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Increasing day length is the primary cue for the timing of sexual maturation in poultry. Typically, Single Comb White Leghorn (SCWL) pullets are reared under conditions of short days (8L:16D) until 18 wk of age. In this study, the effects of varying the age at photostimulation from 16, 18 or 20 wk of age were studied in terms of carcass composition at photostimulation and at sexual maturity, as well as reproductive performance.A flock of 1600 SCWL pullets (Shaver 288 strain) were housed in floor pens in light-tight facilities (8L:16D). All birds were provided with ad-libitum access to both feed and water. At 16 wk, 18 wk and 20 wk, 50 birds per treatment were moved to laying cages and provided to a photoperiod of 14L: 10D. An additional 288 birds per treatment were housed two birds per cage, and group egg production and feed consumption data were collected to 64 wk of age. At photostimulation (n = 20 birds per treatment) and on the day following the first oviposition, (n = 20 birds per treatment) birds were killed by cervical dislocation. All surviving hens were killed at 64 wk of age. All carcasses were studied in terms of selected organ weights and reproductive organ morphology. Birds killed at photostimulation and at sexual maturity were further studied for whole body carcass composition.Significant differences were found in dry matter, water, lipid and ash content among treatment groups at the age of photostimulation. As age at photostimulation increased, absolute weight of carcass fat, protein and ash increased. The percent carcass lipid content increased for all groups between photostimulation and sexual maturity with the 16 wk treatment group showing the largest increase. The time required to reach sexual maturity from the age of photostimulation decreased as the age at photostimulation increased. No significant differences were found in total egg production. The 16 wk group laid significantly smaller eggs. Delaying sexual maturity until 20 wk of age resulted in an increased prime sequence length and fewer pause days to produce approximately the same number of eggs as birds that were photostimulated at 16 wk of age. Key words: Chicken, egg-type hens, sexual maturity, egg production, carcass composition

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

Cited by 62 publications

References 11 publications

Oviposition and egg quality traits of dwarf and naked neck layers

Oviposition and egg quality traits of dwarf and naked neck layers

Effects of altering growth curve and age at photostimulation in female broiler breeders. 2. Egg production parameters

Effects of age at photostimulation on reproductive efficiency and carcass characteristics. 2. Egg-type hens

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