Results 21 to 30 of about 125,988 (221)

Effects of melatonin implants in ewe lambs [PDF]

Reproduction, 1984
Summary. Sixteen pinealectomized and 19 unoperated ewes were exposed to constant light for about 4 weeks before and 4 weeks after lambing. Five ewe lambs born to pinealectomized ewes were implanted s.c. with melatonin sachets and 6 ewe lambs implanted with empty sachets. The 6 ewe lambs born to unoperated dams received empty implants.
D J, Kennaway, T A, Gilmore
openaire   +2 more sources

Effects of breed and age on the performance of crossbred hill ewes sourced from Scottish Blackface dams

Animal, 2011
The aim of this study was to evaluate the effects of age and breed on the reproductive performance and lamb output of crossbred hill ewes relative to purebred Scottish Blackface (BF).
R.W. Annett, A.F. Carson, L.E.R. Dawson, D. Irwin, D.J. Kilpatrick   +4 more
doaj   +1 more source

A NOTE ON MORTALITY OF SOCORRO ISLAND MERINO LAMBS

Tropical and Subtropical Agroecosystems, 2022
Background. The Socorro Island Merino sheep constitutes a unique population in the world whose number is reduced to less than a hundred individuals, thus facing an imminent risk of extinction. Objective.
Rafael Julio Macedo Barragán, Galilea Elizabeth Regla Maldonado, Victalina Arredondo Ruiz, Paola Estefanía Castillo Zamora, Luis Jorge García Márquez   +4 more
doaj   +1 more source

Research progress on the effect of dietary energy level on reproductive performance of ewes

Siliao yanjiu, 2021
Energy is one of the important factors affecting the reproductive performance of ewes. Meeting the energy needs of ewe in different periods is an important measure to improve the efficiency of ewe production, which is of great significance to ensure ewe ...
Li-qin REN, Lei ZHANG, Jing WANG, Xiao-jie YU, Hong-yu CUI, Shang LI   +5 more
doaj  

Effects of sire breed on ewe dystocia, lamb survival and weaned lamb output in hill sheep systems

Animal, 2010
A study was carried out on six hill farms, located in the main hill regions of Northern Ireland, over three breeding seasons to investigate the effect of sire breed on ewe dystocia, lamb survival and weaned lamb output.
M.H.M. Speijers, A.F. Carson, L.E.R. Dawson, D. Irwin, A.W. Gordon   +4 more
doaj   +1 more source

The effect of late pregnancy supplementation of ewes with vitamin E on lamb vigour

Animal, 2009
The experiment measured lamb responses to supplementation of the pregnant ewe diet with vitamin E above requirement. Crossbred ewes were mated with either Suffolk or Texel rams. Twin-bearing ewes were randomly allocated (approximately 21 months of age at
J.A. Rooke, S. Matheson, S. Ison, M. Jack, C.J. Ashworth, C.M. Dwyer   +5 more
doaj   +1 more source

Genetic analysis of a maternal assistance score in sheep

Animal
Maternal behaviour is important for lamb survival, as ewes perform many behaviours that affect the chances of a lamb surviving. Collecting maternal behaviour data directly at lambing is time−consuming and not considered suitable for acquiring the large ...
K. Hay, N. Lambe, J. Roden, S. Jarvis, C.M. Dwyer   +4 more
doaj   +1 more source

Sensory factors involved in mother-young bonding in sheep: a review

Veterinární Medicína, 2016
The aim of this review is to discuss sensory recognition (olfaction, vision, vocalisation, hearing and direct contact) in relation to the ewe-lamb bond, and the relevance of this information for animal management, considering that sensory recognition ...
P. Mora-Medina, A. Orihuela-Trujillo, E. Arch-Tirado, P. Roldan-Santiago, A. Terrazas, D. Mota-Rojas   +5 more
doaj   +1 more source

Mutual recognition between ewes and lambs [PDF]

Reproduction Nutrition Développement, 1980
Studies to investigate the relative value of sight, hearing and smell in mutual recognition between ewes and lambs are described. The method used was to alter clues that could aid in recognition, rather than interfering with the animal's sensory perception. When lambs were coloured with powdered dyes to change appearance, this produced marked avoidance
Shillito Walser, Elizabeth, Alexander, G.   +1 more
openaire   +3 more sources

Relationships between lamb carcass quality traits measured by X-ray computed tomography and current UK hill sheep breeding goals

Animal, 2008
Genetic parameters were estimated between current UK hill sheep breeding goals and lamb carcass composition and muscularity traits derived using X-ray computed tomography (CT).
N.R. Lambe, J. Conington, S.C. Bishop, K.A. McLean, L. Bünger, A. McLaren, G. Simm   +6 more
doaj   +1 more source