Results 31 to 40 of about 192,963 (307)

CANADIAN DAIRY COW DISPOSALS: I. DIFFERENCES BETWEEN BREEDS, LACTATION NUMBERS AND SEASONS [PDF]

Canadian Journal of Animal Science, 1971
Primary reasons for disposal of 26,651 dairy cows of the Ayrshire, Guernsey, Holstein and Jersey breeds were collected in Canadian Record of Performance herds from September, 1967 to August, 1968. Reproduction and low milk production were major causes of voluntary herd removals. The percentages culled annually for these problems ranged from 13.4 to 24.
E. B. BURNSIDE, S. B. KOWALCHUK, D. B. LAMBROUGHTON, N. M. MacLEOD   +3 more
openaire   +1 more source

Environmental and genetic effects on the lactation curves of four genetic groups of crossbred Holstein-Zebu cows

Revista Brasileira de Zootecnia, 2012
The objective of this study was to evaluate the effects of genetic group and environmental factors, including farm of origin, season of calving and lactation number, on the individual lactation curves of 1,010 Holstein-Gyr, Guzerat-Holstein, Holstein ...
Joana Ribeiro da Glória, José Aurélio Garcia Bergmann, Célia Raquel Quirino, José Reinaldo Mendes Ruas, Jonas Carlos Campos Pereira, Ronaldo Braga Reis, Sandra Gesteira Coelho, Martinho de Almeida e Silva   +7 more
doaj   +1 more source

Maternal zinc intakes and homeostatic adjustments during pregnancy and lactation. [PDF]

, 2012
Zinc plays critical roles during embryogenesis, fetal growth, and milk secretion, which increase the zinc need for pregnancy and lactation. Increased needs can be met by increasing the dietary zinc intake, along with making homeostatic adjustments in ...
Donangelo, Carmen, King, Janet
core   +2 more sources

Influence of Lactation Number, Year and Season of Calving on Milk Productivity of Cows

UKRAINIAN BLACK SEA REGION AGRARIAN SCIENCE, 2022
The main characteristics of the milk productivity of Holstein dairy cattle differ in different countries due to differences in terrain, management and breeding objectives. At the same time, the manifestation of non-genetic (that is, environmental) factors during milk production, as a rule, mask the real breeding value of animals.
O. Kramarenko, S. Kramarenko
openaire   +2 more sources

Differential leukocyte count method for bovine low somatic cell count milk [PDF]

, 2003
Whereas many differential leukocyte count methods for high somatic cell count (SCC) milk from mastitic cows are available, only a few have been developed for low SCC milk.
Burvenich, Christian, Dosogne, Hilde, MASSART-LEEN, AM, MEHRZAD, J, Vangroenweghe, Frédéric   +4 more
core   +2 more sources

Effects of lactation number and different stage of lactation on milk yield of Indigenous and Crossbred cows in Bangladesh

International Journal of Natural Sciences, 1970
A total of 54 samples were collected from 18 milking cows from which nine were indigenous and nine were crossbred to evaluate the effects of different lactation number and different stage of lactation on the milk yield. The average daily milk yield of indigenous and crossbred cows at 1st, 2nd and 3rd lactation were 1.311, 1.633, 2.072 and 8.917, 9.567,
N Islam, FMA Hossain, S Ahmad
openaire   +2 more sources

Insights into Lameness in Dairy Cattle: The Role of Body Condition Score and Lactation Dynamics

Veterinary Sciences and Practices
Lameness is a significant welfare and economic issue in dairy farms, resulting in reduced milk yield, increased treatment costs, and higher culling rates.
Yalçın Alper Özturan, İbrahim Akın
doaj   +1 more source

An empirical analysis of the cost of rearing dairy heifers from birth to first calving and the time taken to repay these costs [PDF]

, 2017
Rearing quality dairy heifers is essential to maintain herds by replacing culled cows. Information on the key factors influencing the cost of rearing under different management systems is, however, limited and many farmers are unaware of their true costs.
A.C. Boulton, Bach, Bach, Boulton, Boulton, Boulton, Brickell, Brickell, Cook, Cooke, D.C. Wathes, Dohoo, Ettema, Gabler, Heinrichs, J. Rushton, Jousan, Mohd Nor, Mohd Nor, Mourits, Tozer, Tozer, Vasseur, Waltner-Toews, Wathes   +24 more
core   +2 more sources

Milk Yield, Somatic Cell Count, and Udder Measurements in Holstein Cows at Different Lactation Number and Months

Media Peternakan, 2015
The aim of this study was to investigate the effect of lactation number and months on milk yield, somatic cell count (SCC) and udder measurements in Holstein cows. In the study, 30 first lactation and 49 second lactation, totally 79 Holstein cows housing
A. Ceyhan , M. Cinar , U. Serbester
doaj   +1 more source

Analysis of Genotype × Environment Interaction for milk production in dairy cow

Науковий вісник Львівського національного університету ветеринарної медицини та біотехнологій імені С.З. Гжицького. Серія: Сільськогосподарські науки, 2018
Genotype by environment interaction was studied with 526 lactation milk records of Red Steppe dairy cows maintained at State Enterprise “Breeding reproducer “Stepove” (Mykolayiv region, Ukraine).
S. S. Kramarenko, N. I. Kuzmichova, A. S. Kramarenko   +2 more
doaj   +1 more source