scholarly journals REPRODUCTIVE PERFORMANCE OF DOMESTIC FOWL MAINTAINED UNDER CONTINUOUS LIGHT

Reproduction ◽  
1964 ◽  
Vol 7 (3) ◽  
pp. 409-411 ◽  
Author(s):  
J. K. LAUBER
Keyword(s):  
Reproductive Performance ◽  
Domestic Fowl ◽  
Continuous Light

Eye lesions in domestic fowl reared under continuous light

1966 ◽  
Vol 6 (11-12) ◽  
pp. 619-IN15 ◽  
Author(s):  
Jean K. Lauber ◽  
James McGinnis
Keyword(s):  
Domestic Fowl ◽  
Continuous Light ◽  
Eye Lesions

An experiment with a constant environment for the domestic fowl

1962 ◽  
Vol 4 (1) ◽  
pp. 80-90 ◽  
Author(s):  
Alan W. Greenwood
Keyword(s):  
Relative Humidity ◽  
Reproductive Performance ◽  
Annual Cycle ◽  
Domestic Fowl ◽  
Egg Laying ◽  
Normal System ◽  
Artificial Light ◽  
Pilot Experiment ◽  
Constant Environment ◽  
Environment Temperature

A pilot experiment is described to observe the effect of a constant environment (temperature 65° F., relative humidity, 60%, artificial light for 12 hours daily alternating with 12 hours darkness, and constant diet) on the subsequent reproductive performance of fowls maintained under these conditions from hatching to the end of the 3rd annual cycle of egg laying.The elimination of normal seasonal moulting of the plumage both at the beginning and at the end of the pullet laying year gave an advantage of 57 eggs for experimental birds over a group of sisters maintained under a more normal system of intensive husbandry.This advantage in eggs laid was much reduced in succeeding years owing to a persistent and continuing decrease in rate of lay of hens in the constant environment.All eggs were incubated and, although no differences in fertility, dead germs and hatchability were observed over the first full year of production in the birds in contrasting environments, the deleterious effects of a constant environment became increasingly apparent with age.It is suggested that control of the environment induces a premature senility in the domestic fowl.

The reproductive performance of two British breeds of sheep in contrasting photoperiodic environments

1974 ◽  
Vol 82 (2) ◽  
pp. 377-381 ◽  
Author(s):  
H. Ll. Williams
Keyword(s):  
Adverse Effect ◽  
Breeding Season ◽  
Reproductive Performance ◽  
Cyclic Subgroup ◽  
Reproductive Potential ◽  
Continuous Light ◽  
Differential Response ◽  
Short Period

SummaryThe reproductive performance of breeding and cyclic Welsh Mountain (WM) and Border Leicester (BL) ewes was compared in two contrasting photoperiodic environments during January 1971–April 1972. Treatment 1 consisted of natural daylength changes at latitude 51° 43’ N. There was no difference between the two breeds in onset of the breeding season, percentage exhibiting oestrus or percentage lambing. The breeding season of BL ewes terminated earlier (mean date, 31 January) than that of WM ewes (mean date, 9 March). The WM ewes had 8–12 oestrous periods and the BL ewes 7–11 oestrous periods. In treatment 2 a simulated equatorial photoperiod (13 h light: 11 h dark) was applied from January 1971 but was inadvertently interrupted by a short period of continuous light in June 1971. All WM ewes exhibited oestrus compared with 37·5% of BL ewes. The failure to show oestrus in the majority of BL ewes contributed to the marked difference between breeds in the percentage of ewes lambing: 88·9% in WM compared with 11·1% in BL ewes. In the cyclic subgroup, the WM ewes had 3–10 oestrous periods and the BL ewes, 2–7 oestrous periods.It is concluded that the breeds showed a differential response to the two treatments and that Treatment 2 had a marked adverse effect on the reproductive potential of the Border Leicester ewes.

The reproductive performance of Border Leicester ewes in contrasting photoperiodic environments

1974 ◽  
Vol 83 (1) ◽  
pp. 101-104 ◽  
Author(s):  
H. Ll. Williams ◽  
C. J. Thwaites
Keyword(s):  
Reproductive Performance ◽  
Reproductive Potential ◽  
Continuous Light ◽  
Reproductive Function ◽  
Fluctuating Light ◽  
The Mean ◽  
Group 2 ◽  
Light Group ◽  
Light Rhythm ◽  
Group 1

SUMMARYBorder Leicester ewes were kept in three contrasting photoperiodic environments, the rhythm at latitude 30° 32′ S (group 1) - 12 h light: 12 h dark interrupted by 6 weeks of continuous light (group 2a) and 12 h light: 12 h dark (group 2b) - from August 1972 to September 1973. In group 1 all ewes exhibited oestrus compared with 87·5% and 57·1% in groups 2(a) and 2(b) respectively. The mean number of oestrous periods per ewe ranged from 4·4 in group 1 to 3·0 in group 2(a) and 1·0 in group 2(b). It is concluded that the non-fluctuating light rhythm had an adverse effect on the reproductive potential of the treated groups and that Border Leicester ewes are dependent on a fluctuating light rhythm for normal reproductive function.

Further Studies on the Ultrastructure of Harderian Gland in Adult Rats

1974 ◽  
Vol 32 ◽  
pp. 288-289
Author(s):  
Alfredo Feria-Velasco ◽  
Guadalupe Tapia-Arizmendi
Keyword(s):  
Fine Structure ◽  
Domestic Fowl ◽  
Animal Species ◽  
Acinar Cells ◽  
Harderian Gland ◽  
Myoepithelial Cells ◽  
The Other ◽  
Albino Rats ◽  
Adult Rats ◽  
Cell Components

The fine structure of the Harderian gland has been described in some animal species (hamster, rabbit, mouse, domestic fowl and albino rats). There are only two reports in the literature dealing on the ultrastructure of rat Harderian gland in adult animals. In one of them the author describes the myoepithelial cells in methacrylate-embbeded tissue, and the other deals with the maturation of the acinar cells and the formation of the secretory droplets. The aim of the present work is to analize the relationships among the acinar cell components and to describe the two types of cells located at the perifery of the acini.

Amphetamine Suppresses Activity and Distress Vocalizations in Domestic Fowl Cockerels

2002 ◽  
Author(s):  
Rebecca A. Sheffield ◽  
Pamela A. Komassa ◽  
Michael R. Baker
Keyword(s):  
Domestic Fowl ◽  
Distress Vocalizations

РОДСТВЕННЫЕ ГРУППЫ РЕДКИХ ПОРОД ГУСЕЙ

2019 ◽  
Keyword(s):  
Reproductive Performance ◽  
Gene Pool

ЖАРКОВА И.П., ГРИШИНА Д. С. Федеральный научный центр «Всероссийский научно-исследовательский и технологический институт птицеводства» Российской академии наук Аннотация: Авторами изучены генетические параметры хозяйственно-полезных признаков гусей (сохранность, яйценоскость, масса яиц, оплодотворенность и выводимость яиц, вывод гусят) в зависимости от их происхождения. Новизна работы заключается в том, что впервые проведен анализ закономерностей проявления репродуктивных качеств у родственных групп гусей. При сравнительном изучении 21 породы гусей установлено, что группа пород гусей, родственных между собой по общему селекционному предку, а именно китайской серой породе (1-я родословная), имеет более высокие воспроизводительные способности по сравнению с другими породами и группами пород. Полученные данные будут применяться в дальнейшей работе с целью совершенствования приемов сохранения генофонда малочисленных пород гусей. Ключевые слова: ГЕНОФОНД ПОРОД ГУСЕЙ, РОДСТВЕННЫЕ ГРУППЫ, РЕПРОДУКТИВНЫЕ КАЧЕСТВА, GENE POOL OF GEESE BREEDS, BIOGENETICALLY RELATED GROUPS OF BREEDS, REPRODUCTIVE PERFORMANCE

ПРЕРЫВИСТОЕ ОСВЕЩЕНИЕ ПОВЫШАЕТ ЭФФЕКТИВНОСТЬ ИСКУССТВЕННОГО ОСЕМЕНЕНИЯ КУР В КЛЕТКАХ

2019 ◽  
Keyword(s):  
Reproductive Performance ◽  
Artificial Insemination ◽  
Egg Production ◽  
Laying Hens ◽  
Electric Energy ◽  
Productive Performance ◽  
Feed Conversion ◽  
Scientific Center ◽  
Academy Of Sciences ◽  
Egg Fertility

Intermittent Lighting Improves the Efficiency of Artificial Insemination in Cage Housed Laying Hens Kavtarashvili A.Sh., Kolokolnikova T.N. Federal Scientific Center “All-Russian Research and Technological Poultry Institute” of Russian Academy of Sciences Omsk Agrarian Scientific Center Summary: The effects of different lighting regimes on the oviposition schedule, productive performance, and reproductive efficiency in cage housed laying hens of layer parental flock (Hisex White-R) were studied; the reasonable regime of artificial insemination (AI) under intermittent lighting is proposed. It was found that intermittent lighting regime 1L:4D:4L:1D:4L:10D compared to the constant lighting significantly alters oviposition schedule: under this regime 82.3% of all daily eggs were laid until 9 am (vs. 66.6% in control). This regime and AI at 10 am improved the productive and reproductive performance compared to control (constant lighting 16L:8D and AI at 12 am): mortality by 1.9%, egg production per initial hen by 3.8%, egg weight by 1.1%, percentage of eggs suitable for incubation by 1.9%, egg fertility by 0.9%, hatchability by 2.3%, hatch of chicks by 2.9%, feed conversion ratio (kg of feed per 10 eggs) by 5.3%, the expenses of electric energy for lighting (per 1000 eggs suitable for incubation) by 54.5%. Key words: INTERMITTENT LIGHTING, CAGE HOUSED LAYERS, ARTIFICIAL INSEMINATION (AI), OVIPOSITION SCHEDULE, AI TIMING, PRODUCTIVE PERFORMANCE, REPRODUCTIVE PERFORMANCE

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