tailieunhanh - Study on stable lactation of Jersey cross breed

Milk yield data of 4 Jersey cross cows were taken from Dairy Farm of Department of Silviculture and Agroforestry, Dr. Y S Parmar University of Horticulture and Forestry Nauni- Solan, Himachal Pradesh from 1978- 2014. Data were used on stability analysis of milk yield of Jersey cross cows to find out stable lactation. Wricke proposed „Ecovalence‟ based on means. Study on Wricke ecovalence indicates a generalized estimate of study of performance based on means under more than two months. Ecovalence is generally expressed in percentage. As percentage of ecovalence (Wi) is inversely associated with lactation stability, a low percentage of Wi indicates high stability of performance. Therefore, lactation 5 was found to be high stable lactation. | EXCELLENT PUBLISHERS International Journal of Current Microbiology and Applied Sciences ISSN 2319-7706 Volume 8 Number 03 2019 Journal homepage http Original Research Article https Study on Stable Lactation of Jersey Cross Breed Radhika Thakur . Gupta and . Mahajan Department of Basic Sciences College of Forestry Dr. Y. S. Parmar University of Horticulture and Forestry Nauni- Solan Himachal Pradesh-173230 India Corresponding author ABSTRACT Keywords Stability analysis Wricke Ecovalence Model Lactations Milk yield Jersey cross breed Article Info Accepted 15 February 2019 Available Online 10 March 2019 Milk yield data of 4 Jersey cross cows were taken from Dairy Farm of Department of Silviculture and Agroforestry Dr. Y S Parmar University of Horticulture and Forestry Nauni- Solan Himachal Pradesh from 19782014. Data were used on stability analysis of milk yield of Jersey cross cows to find out stable lactation. Wricke proposed Ecovalence based on means. Study on Wricke ecovalence indicates a generalized estimate of study of performance based on means under more than two months. Ecovalence is generally expressed in percentage. As percentage of ecovalence Wi is inversely associated with lactation stability a low percentage of Wi indicates high stability of performance. Therefore lactation 5 was found to be high stable lactation. Introduction The Jersey breed originated on the Island of Jersey a small British island in the English Channel off the coast of France and the Jersey is one of the oldest dairy breed. Of all major dairy breeds the Jersey s milk boasts the richest content. The milk is very high in butterfat which provides a better- tasting product. It is also used for making cheese and butter. Jersey cows are outstanding milk producers producing more milk per each pound of body weight than other types of bovines. The record for milk production by one cow is held by a Jersey. The Jersey produces more milk