Reproductive performance of confined sheep in an accelerated controlled breeding program under two lighting regimes

1982 ◽  
Vol 18 (6) ◽  
pp. 621-628 ◽  
Author(s):  
A.J. Hackett ◽  
M.S. Wolynetz
Keyword(s):  
Reproductive Performance ◽  
Breeding Program

Reproductive Performance of Wild Brooders of Indian White Shrimp, Penaeus indicus: Potential and Challenges for Selective Breeding Program

2019 ◽  
Vol 86 (sp1) ◽  
pp. 65 ◽  
Author(s):  
Panantharayil Sudhayam Shyne Anand ◽  
Changaramkumarath P. Balasubramanian ◽  
Biju Francis ◽  
Akshaya Panigrahi ◽  
Radhakrishnapillai Aravind ◽  
...  
Keyword(s):  
Reproductive Performance ◽  
Selective Breeding ◽  
Breeding Program ◽  
White Shrimp ◽  
Penaeus Indicus

Reproductive Performance of Ewes in an Early-Weaning, Controlled-Breeding Program

1970 ◽  
Vol 31 (5) ◽  
pp. 927-932
Author(s):  
E. F. Ellington ◽  
A. D. Knight ◽  
C. W. Fox
Keyword(s):  
Reproductive Performance ◽  
Breeding Program ◽  
Early Weaning

REPRODUCTIVE PERFORMANCE OF HORMONALLY TREATED SHEEP MAINTAINED YEAR-ROUND IN A CONTROLLED-LIGHT ENVIRONMENT

1982 ◽  
Vol 62 (4) ◽  
pp. 1109-1117 ◽  
Author(s):  
A. J. HACKETT ◽  
H. A. ROBERTSON ◽  
H. A. ROBERTSON ◽  
R. J. DWYER ◽  
M. S. WOLYNETZ
Keyword(s):  
Key Words ◽  
Reproductive Performance ◽  
Similar Pattern ◽  
Treatment Effects ◽  
Hormone Treatment ◽  
Breeding Program ◽  
Light Environment ◽  
Day Length ◽  
Ovarian Activity ◽  
Prostaglandin F

Six experiments were conducted on hormonally treated ewes maintained year-round in a controlled-light environment in a breeding program designed to produce three lamb crops in 2 yr. Various combinations of fluorogestone acetate (FGA), prostaglandin F2α (PGF2α) and pregnant mares' serum gonadotrophin (PMSG) were used to synchronize estrus in the ewes. There were no significant differences (P > 0.05) in fertility between FGA- and PGF2α-treated ewes when the ewes were having cyclic ovarian activity (cycling) at the time of treatment, i.e. in January and May in our system. Among ewes in the constant day-length lighting regime, fertility was lower in September than in January or May. Prolificacy ranged from 1.7 to 2.0 in the six experiments. Fecundity, a measure of the overall productivity, followed a similar pattern to fertility and was not significantly (P > 0.05) affected by the various treatments. These findings demonstrated the feasibility of maintaining a controlled 8-mo breeding program for sheep maintained year-round in a controlled-light environment. Key words: Reproduction in sheep, controlled light, hormone treatment effects.

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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