Heritablity Estimates of Some Clutch Traits in the Laying Hen.

Luc, Kieu Minh; Miyoshi, Shunzo; Suzuki, Mitsuyoshi; Mitsumoto, Takatsugu

doi:10.2141/jpsa.33.23

Cited by 16 publications

(12 citation statements)

References 6 publications

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“…However, the mean lag between successive ovipositions in sequences was lower than that noted in our study, except for the last eggs in sequences. In two Leghorn hen lines, Luc et al (1996) estimated the mean lag for sequences as 1.04 and 1.32 h. In our experiment, mean lag for all sequences exceeded 2 h but we did not consider very long sequences of more than 10 eggs. However, mean lag values for the sequences analyzed in this study were similar to those calculated by Johnston and Gous (2003) based on predicted ovulation times using a mathematical model of the ovulation cycle of the laying hen.…”

Section: Resultsmentioning

confidence: 94%

Laying pattern parameters in broiler breeder hens and intrasequence changes in egg composition

Gumułka¹,

Kapkowska²,

Maj³

2010

Czech J. Anim. Sci.

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ABSTRACT:The aim of the study was to analyze the pattern of oviposition time in laying sequences in broiler breeder hens and to determine a relationship between egg position in the sequence and egg quality. The sequences were described using mean oviposition time (hour) within a sequence, mean lag of oviposition time between successive ovipositions, and mean and cumulative lag of oviposition for a sequence. Egg weight, percentage of egg components and shape index were determined for successive eggs in a sequence. The 2-, 3-, 4-, 5-to 6-and 7-to 9-egg sequences were considered. The light/dark regime was 16 h/8 h (05:00 a.m. to 09:00 p.m.). Hens laid the first egg in a sequence about 3.5 h after the beginning of the photoperiod. With increasing sequence length, the first egg was laid sooner after the beginning of the photoperiod and the intervals between successive ovipositions shortened. This suggests that when planning the frequency of egg collection in a flock of broiler breeder hens, one should account for changes in the egg sequence length during the production period. No significant relationship between egg position in the sequence and quality of egg components was observed.

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Section: Resultsmentioning

confidence: 94%

Laying pattern parameters in broiler breeder hens and intrasequence changes in egg composition

Gumułka¹,

Kapkowska²,

Maj³

2010

Czech J. Anim. Sci.

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“…The laying rhythm has been studied for several species of domestic fowls, for instance laying hens (Lillpers and Wilhelmson, 1993;Luc et al, 1996, Bednarczyk et al, 2000, ducks (Simmons and Hetzel, 1983), geese (Rosinski et al, 2006) and turkeys (Pyrzak and Siopes, 1989). In general, the results seem to be promising.…”

Section: Introductionmentioning

confidence: 99%

Genetic relationships among time of egg formation, clutch traits and traditional selection traits in laying hens

Wolc¹,

Bednarczyk²,

Lisowski³

et al. 2010

J. Anim. Feed Sci.

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In a population of Rhode Island White hens heritability of egg formation, clutch characters and traditional selection traits as well as the genetic and phenotypic correlations between them were estimated via multitrait animal model. Over 1300 birds and about 4000 birds were recorded in two consecutive generations for oviposition time and traditional traits, respectively. The heritability estimates obtained for age at first egg (h 2 =0.42), egg weight (h 2 =0.50) and body weight (h 2 =0.42) were considerably higher than those for initial egg production (h 2 =0.22), clutch traits (h 2 between 0.11 and 0.23) and oviposition time (h 2 between 0.13 and 0.19). Both genetic and phenotypic correlations between clutch traits and traditional selection traits were low, except for initial egg production and maximal clutch length (r g =0.40 and r p =0.38). As expected, negative correlations were registered for number of clutches and average clutch length. It indicates an opportunity of selection aimed at improvement of egg production persistence by an increase in the average clutch size. Oviposition time was favourably correlated with traditional selection criteria.

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“…In der Vergangenheit wurden bereits Untersuchungen zu den Legesequenzen einzelner Hennen, in herkömmlichen Einzelkäfigen (McCLUNG et al 1976, AYORINDE und OLAGBUYIRO 1991, LILLPERS und WILHELMSON 1993, LUC et al 1996, BEDNARCZYK 2000, AKBAS et al 2002, CHEN und TIXIER-BOICHARD 2003 …”

Section: Diskussionunclassified

Genetische Analyse des Legemusters in der Bodenhaltung im Hinblick auf neue Leistungsprüfungskriterien für die Legehennenzucht

et al. 2009

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Abstract. Title of the paper: Genetic analysis of the laying pattern in floor management in terms of new performance parameters for breeding In order to facilitate a specific selection of laying hens which are suitable for alternative housing systems, it will be of advantage if the individual hens were tested in their later husbandry environment. Therefore, a new technology has been developed, the »Weihenstephan Funnel Nest Box«, which enables the automatic recording of these essential performance and nesting behaviour parameters of the individual hens in a group housing system. The exact oviposition times of 263 laying hens of Lohmann Silver line were recorded and used to analyse the laying pattern. Some results which were already pointed out in literature were thus confirmed, other brought new cognitions in terms of the oviposition pattern and about the pause following a laying sequence. A positive genetic correlation between the length of a laying sequence and the subsequent pause durations (rg=+0.49) confirmed the tendency to longer breaks following an increasing laying sequence. The duration of a break was, however, not such an essential criteria for the productivity of a hen. More important in this context was the number of pauses which rises constantly with the number of laying sequences over the whole observation period. When the hens laid in shorter sequences, it was observed that the proportion of sequences grew, which was reflected as smaller number of registered eggs per hen (rg =−0.73). The logical conclusion was the highly positive correlation between the length of a laying sequence and the number of registered eggs (rg =+0.82). Closely associated with the length of a laying sequence, as well as the laying performance, was the parameter time interval between two laid eggs. The time interval between two laid eggs was significant shortened from the first to the third egg within one laying sequence and eventually reached for more than 24 h for most of the hens. The phenotypic and genetic correlation between the time interval and the laying performance was negative (rp =−0.46 and rg =−0.46). The heritability for the time interval was estimated at h²=0.17 which was similar to the heritability for number of eggs (h²=0.20). Slightly higher heritabilities were estimated for the indirect parameter of the time interval, the oviposition time of the third to the fifth egg in a laying sequence (h²=0.25, h²=0.34 and h²=0.29). Valuations in this range would be in regard of new performance testing parameter competitive to the parameter number of eggs and therefore, be tested in further investigations.

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Heritablity Estimates of Some Clutch Traits in the Laying Hen.

Cited by 16 publications

References 6 publications

Laying pattern parameters in broiler breeder hens and intrasequence changes in egg composition

Laying pattern parameters in broiler breeder hens and intrasequence changes in egg composition

Genetic relationships among time of egg formation, clutch traits and traditional selection traits in laying hens

Genetische Analyse des Legemusters in der Bodenhaltung im Hinblick auf neue Leistungsprüfungskriterien für die Legehennenzucht

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