Results 31 to 40 of about 48,394 (303)

Environmental factors on the prediction of the lactation curve of Holstein cows [PDF]

Pesquisa Agropecuária Brasileira
The objective of this work was to evaluate the influence of environmental factors on the lactation curve parameters and milk yield of Holstein cows. Data on lactations conducted from 2010 to 2019 in the state of Paraná, Brazil, obtained from the official
Amauri Felipe Evangelista, Rafaela Martins, Altair Antônio Valotto, Laila Talarico Dias, Rodrigo de Almeida Teixeira   +4 more
doaj   +1 more source

Evaluation of lactation models in pasture-based dairy ewes in Bosnia and Herzegovina

Mljekarstvo, 2020
Milk of Kupres, Privor and Stolac dairy ewe breeds is used for the production of the fine cheese varieties. To the best of our knowledge there are no information about milk production and milk composition of these pasture-based dairy ewes. The aim was to
Dragica Šalamon, Vinko Batinić, Stanko Ivanković, Neven Antunac, Alen Džidić   +4 more
doaj   +1 more source

Characteristics of Lactation Curve and Reproduction in Dairy Cattle

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2023
The purpose of the research was to assess changes in the lactation activity of cows and their impact on the level of reproduction, as well as to study their fluctuations with respect to genetic and environmental factors.
Sergiy Ruban, Viktor Danshyn, Мykhailo Matvieiev, Oleksandr O. Borshch, Oleksandr V. Borshch, Lesia Korol-Bezpala   +5 more
doaj   +1 more source

Modelling Lactation Curve for Genetic Evaluation of Crossbred Cattle

International Journal of Bio-Resource and Stress Management, 2023
The present study was conducted on first lactation 4415 monthly test-day milk yield records of 466 crossbred (CB) cattle sired by 89 bulls during 2000–2018 (19 years) maintained at Directorate of Livestock Farms, GADVASU, Ludhiana, Punjab, India.
Rohit Gupta, S. K. Sahoo, Simarjeet Kaur, S. K. Dash, Puneet Malhotra   +4 more
doaj   +1 more source

Comparative study of lactation curves and milk quality in Holstein versus Swedish Red and White-Holstein Cross Cows [PDF]

, 2018
The objective of this study reported in this research paper was to compare the lactation curves of the production of milk, fat, protein, percentages of fat and protein, and somatic cell score in purebred Holstein (H) cows and Swedish Red and White (SRW) -
Lembeye, Felipe, Lopez Villalobos, Nicolas, Piccardi, Mónica Belén, Pipino, Diego, Vazquez, Maria Isabel   +4 more
core   +1 more source

Lactation curves for milk yield, fat and protein content in Slovenian dairy sheep

Czech Journal of Animal Science, 2012
Lactation curves for daily milk yield, fat, and protein content in three dairy sheep breeds were estimated by the repeatability animal model using test-day records.
A. Komprej, G. Gorjanc, D. Kompan, M. Kovač   +3 more
doaj   +1 more source

Transcriptome provides insights into bovine mammary regulatory mechanisms during the lactation cycle

Journal of Applied Animal Research, 2022
The molecular events underlying the lactation curve of dairy animals have long been a biological conundrum for mammary biologists, and a cause of a considerable loss of income for dairy farmers.
Xuyang Song, Meng Zhao, Qiaoqiao Cao, Shengxuan Wang, Ranran Li, Xuan Zhang, Letian Zhang, Kerong Shi   +7 more
doaj   +1 more source

Estimating Holstein Lactation Curves with a Gamma Curve

Journal of Dairy Science, 1977
Abstract Milk production records of healthy Holstein cows were analyzed with the model: Yi = β 1 t i β 2 e − β 2 ti + ∈ i where Y i is milk production in kilograms at a specific time (t i ) in months. The parameters in this model were estimated with the techniques of intrinsically nonlinear regression.
D. Wayne Kellogg, N. Scott Urquhart, A.J. Ortega   +2 more
openaire   +1 more source

Breed, heterosis, and recombination effects for lactation curves in Brazilian cattle

Revista Brasileira de Zootecnia, 2021
The objective of this study was to estimate the breed, heterosis, and recombination effects on different components of the lactation curve of Girolando cattle. The dataset used consisted of 12,121 purebred cows of Holstein (H) and Gyr (G) breeds, and six
Darlene dos Santos Daltro, Alessandro Haiduck Padilha, Luís Telo da Gama, Marcos Vinícius Gualberto Barbosa da Silva, Jaime Araujo Cobuci   +4 more
doaj   +1 more source

Diversity of dairy goat lactation curves in France [PDF]

Journal of Dairy Science, 2018
A high level of production at the peak of lactation may be associated with animal health disorders, high feeding costs, and reduced milk supply throughout the year. The objective of this study was to typologize the lactation curves in French dairy goats and analyze the influence of environmental and genetic factors on these curves.
Arnal, Mathieu, Robert-Granié, Christèle, Larroque, Helene   +2 more
openaire   +4 more sources