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Monday, July 20, 2020 | History

2 edition of effect of age and breed on diet selection by sheep found in the catalog.

effect of age and breed on diet selection by sheep

G. W. Arnold

effect of age and breed on diet selection by sheep

by G. W. Arnold

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  • 34 Currently reading

Published by Commonwealth Scientific and Industrial Research Organisation, Australia in Melbourne .
Written in English


Edition Notes

StatementG. W. Arnold, N. A. Campbell and P. J. Pahl.
SeriesLand Resources Management technical paper -- no. 11
ContributionsCampbell, N. A., Pahl, P. J., Commonwealth Scientific and Industrial Research Organization. Division of Land Resources Management.
The Physical Object
Pagination8p.
ID Numbers
Open LibraryOL15099654M
ISBN 100643004238

Knowing the causes of lamb loss - either through the death of lambs during pregnancy or after they are born - and how to prevent it, is one way to help ensure successful sheep breeding. This guide explains how to manage factors that affect ewe fertility, including the breeding cycle, breeding age, and the ram effect. Genotype and age effects on sheep meat production. 5. Lean meat and fat content in the carcasses of Australian sheep genotypes at , and kg carcass weights been due to a variation in selection of diet under grazing conditions, which may result in the faster growing animals having increased feed intake and a lower protein:energy ratio.

Effect of BCS, live weight (static effects) and changes in BCS and live weight (dynamic effects) before mating, during mating and after mating period, on reproductive efficiency of different breeds of sheep in the different rearing systems were studied (Coop, ; Gonzalez et al., ; Gunn and Doney, ; Cam et al., ).   D’Alessandro AG, Maiorano G, Ragni M et al () Effect of age and season of slaughter on meat production of light lambs: carcass characteristics and meat quality of Leccese breed. Small Ruminant Res (1)– CrossRef Google ScholarCited by: 1.

Diet selection by sheep and cattle INTRODUCTION The need for comparative studies of diet selection by grazing sheep and cattle in which attention is paid to the influence of sward conditions on the diets selected has been argued by Hodgson & Grant (). Such information is particularly relevant to decisions about. Protein level fed pre-or-post conception had no effect on the performance or future breeding success of the heifers offspring. Planned activity The results will be used to produce a number of articles and a number of on-farm events have already been delivered to the industry as part of this project.


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Effect of age and breed on diet selection by sheep by G. W. Arnold Download PDF EPUB FB2

Get this from a library. The effect of age and breed on diet selection by sheep. [G W Arnold; N A Campbell; P J Pahl] -- Verslag van 6 onderzoeken naar het verband tussen leeftijd en voedselvoorkeur bij schapen in Australie. Er zijn verschillen gevonden tussen. Diet selection of sheep: effects of adding urea to foods with different protein contents.

Two experiments were conducted in which growing sheep were given choices between foods differing in their contents of urea. The crude protein (CP) contents of both of the foods of the pair were also by: Animals and diets Two experiments were undertaken: Experiment 1 examined the use of two dif- ferent breeds of sheep and Experiment 2 studied the effect of BW and age within a single breed type.

Experiment 1 involved 16 1-year old wether sheep comprising eight Cheviot and eight Suffolk cross breed Cited by: The effects of fasting on diet preference were studied by releasing flocks of three sheep onto 025 ha plots of land, which were either 20% clover (and 80% grass) or 80% clover (and 20% grass), by area.

Grazing behaviour and diet selection by Dorper sheep. The grazing behaviour and diet selection by Dorper sheep, as well as other related aspects (pasture intake, walking habits and trampling) is reviewed. It was clear that Dorper sheep are less-selective grazers, compared to Merino-type breeds.

The incidence of lamb mortality from birth 8 to months of age has been studied over a 6-year period in an upland, grassland flock of sheep comprising the Scottish Blackface, Cheviot and Welsh Mountain breeds and the crosses among these breeds.

Each breed and cross-bred type was maintained at varying levels of inbreeding. ApproximatelyCited by: Genetics of Reproduction in Sheep is a compilation of papers that are concerned with the study and application of genetics to the reproduction in sheep.

The book is divided into six parts, grouping the papers according to topic. Age: Animal age can also profoundly affect diet selection and tolerance to secondary compounds.

Metabolic requirements decline with age, so older animals need less food and spend less time foraging. Metabolic requirements decline with age, so older animals need less food and spend less time foraging.

The age of puberty is influenced by breed, genetics, size (weight), nutrition, and season of birth. Most ewe lambs reach puberty between 5 and 12 months of age.

Ewe lambs will tend to reach puberty their first fall. For this reason, spring-born ewe lambs tend to exhibit puberty earlier than fall-born ewe lambs.

of weight and age variables in four major sheep breeds (Columbia, Polypay, Rambouillet, and Targhee). Weights, ages, and the binary traits of fertility (preg-nant or nonpregnant) and prolificacy (one lamb born vs.

two or more) were collected on 2, ewe lambs at the U.S. Sheep Experiment Station, Dubois, ID, from through Breeding ewe lambs. Ewe lambs that breed and lamb as yearlings generally have a greater lifetime production than ewes that have their that first lamb as 2 year olds.

Since the onset of puberty depends largely upon body weight, ewe lambs should be provided adequate levels of nutrition to reach at least two-thirds of mature weight before breeding.

MATERNAL FLOCK SELECTION Age When starting a sheep enterprise, you can start with ewe lambs or yearlings that have never lambed and/or mature ewes that have already produced offspring -- or a combination of ewes of different ages.

It is probably better to start with ewes of similar ages, as they require similar feeding and management. Winter-born lambs should be weaned and adjusted to a growing diet by the time they are two months of age.

A growing diet for lambs weighing 40 to 70 pounds should contain approximately 78 percent TDN and 16 percent crude protein. At body weights of 70 pounds and up, the level of crude protein in the diet can be lowered to 14 percent.

Breed selection can greatly influence reproductive performance, particularly prolificacy and age at first lambing. Sheep breeds around the world are very diverse in performance, and it is advisable to be familiar with the traits of some of the more popular ones.

of the diet. Total Digestible Nutrients (TDN) % An estimate of the energy content in the diet which can be used by the animal. TDN values are expressed as a percentage of the diet. Calcium % Important in bone strength and development, reproduction, milk production and body maintenance.

Calcium levels are expressed as a percentage of the diet. A ten-year food preference database (–) was used to relate food selection in dogs to the nutritional components of diets by doing a principal component analysis (PCA) and a linear regression between components obtained and dogs’ preferences.

Intake and preference of preferred diets were analyzed by dogs’ sex, breed, age, body weight, and the season of the year (hot or cold).Author: Raúl A. Alegría-Morán, Sergio A.

Guzmán-Pino, Juan I. Egaña, Valeria Sotomayor, Jaime Figueroa. Do Thi Thanh Van, Some animal and feed factors affecting feed intake, behaviour and performance of small ruminants. Doctor’s dissertation. ISSNISBN The overall objective of this thesis was to assess the effect of some animal and feed factors on feed intake, behaviour and performance of small Size: KB.

The duration of estrus (~30 hr) is influenced by the breed and age of the ewe, the onset of puberty, the presence of the male, and the season. Estrous periods that occur in the autumn are longer and more intense, and maiden ewes have a shorter and less intense estrus than mature ewes.

This is of particular importance to producers who breed ewes to lamb first at 12 to 18 months of age. Exercise. Grazing sheep may use from 10 to percent more energy than do sheep in drylot conditions. However, the magnitude of increase depends on the distance sheep must travel to feed and water, and on the topography of the range.

Climate. Sheep need a balanced diet containing energy (fat and carbohydrates), protein, vitamins, minerals and water. Different nutritional needs of sheep. Nutritional needs vary greatly, depending on the size, age and physiological status of the sheep. For example: larger and older sheep sometimes need more nutrients than younger and smaller ones.

enhances milk production, and alters blood metabolites. Lactation and body weight effects of UIP in postpartum cows may be dependent on amount of UIP added to the diet, parity, and/or protein content of the forage [32].

However, regardless of a possible effect on reproductive performance, overfeeding protein should be discouraged.The effect of litter size on birth weight was strengthened (F =Pbreeds of sheep Cited by: factors affecting sheep breeding. STUDY. PLAY. To achieve high productivity and profits on a sheep farm it is fundamental to.

have a high lambing percentage. Topography - can be influenced to some degree How? where we choose to mate the ewes and where Ewe Age .