Article
Agriculture, Dairy & Animal Science
Han Li, Yifeng Zhang, Rong Li, Yan Wu, Dingran Zhang, Hongrun Xu, Yangdong Zhang, Zhili Qi
Summary: This study found that climatic conditions under different temperature-humidity index levels may induce varying degrees of oxidative stress, inflammation response, and stress hormone imbalances in lactating dairy cows.
Article
Agriculture, Multidisciplinary
Lucas Eduardo de Oliveira Aparecido, Joao Antonio Lorencone, Pedro Antonio Lorencone, Guilherme Botega Torsoni, Jose Reinaldo da Silva Cabral Moraes, Kamila Cunha Meneses
Summary: In this study, a bioclimatic zoning for dairy cattle in the Midwest region of Brazil was established using meteorological data. The impact of climate factors on milk production was estimated. The results showed three Temperature and Humidity Index (THI) classifications in the Midwest region throughout the year: 'normal', 'alert', and 'critical alert'. During spring and summer, a reduction in milk production of 1 to 2 kg was observed for cows with a daily production level of 25 kg, while cows with a daily production level of 10 kg showed no reduction in milk production.
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
(2022)
Review
Agriculture, Dairy & Animal Science
Eleni Dovolou, Themistoklis Giannoulis, Ioannis Nanas, Georgios S. Amiridis
Summary: Global warming poses a significant threat to the dairy sector, affecting both tropical and temperate regions. High temperatures compromise the welfare and fertility of dairy cows, leading to economic losses for farmers. Dairy cows employ various adaptive mechanisms to cope with heat stress, but the disruption of hormone secretion has long-lasting effects on fertility. Mitigation measures can restore milk production, but summer fertility records remain low due to the multifaceted nature of sustaining high fertility and proper reproductive processes.
Article
Agriculture, Dairy & Animal Science
Ketema Worku, Yisehak Kechero, Geert P. J. Janssens
Summary: In many tropical countries such as Ethiopia, despite having high numbers of cattle, milk production remains low due to traditional animal management practices, lack of supplementary feeds, and poor pasture management leading to overgrazing and soil erosion. This negatively impacts dairy cow productivity. The research evaluated the nutritional status of ranging dairy cows through blood metabolites, milk yield, and body condition in relation to environmental factors, showing that metabolite analysis can provide insights into the nutritional status of ranging animals.
JOURNAL OF DAIRY SCIENCE
(2021)
Article
Multidisciplinary Sciences
Soparak Khemarach, Saowaluck Yammuen-art, Veerasak Punyapornwithaya, Sutichai Nithithanasilp, Narongrit Jaipolsaen, Siwat Sangsritavong
Summary: In tropical climates, beta-carotene supplementation can improve reproductive performance in cows by reducing oxidative stress, as demonstrated in this study in Thailand.
SCIENTIFIC REPORTS
(2021)
Article
Agronomy
Mindaugas Televicius, Vida Juozaitiene, Dovile Malasauskiene, Ramunas Antanaitis, Arunas Rutkauskas, Mingaudas Urbutis, Walter Baumgartner
Summary: In this study, cow health status and reproductive success were indicated by inline registered milk lactose concentration. Cows with higher lactose concentration showed more activity, lower milk electrical conductivity and somatic cell counts, and higher glucose concentration. Additionally, lower levels of milk lactose could be used for early identification of metabolic disorders and mastitis.
Article
Agriculture, Dairy & Animal Science
Taiyu Shen, Feng Xu, Zhiyuan Fang, Juan J. Loor, Hongsheng Ouyang, Meng Chen, Bo Jin, Xinghui Wang, Zhen Shi, Yiwei Zhu, Yusheng Liang, Lingxue Ju, Yuxiang Song, Zhe Wang, Xinwei Li, Xiliang Du, Guowen Liu
Summary: This study found that cows with subclinical ketosis have increased expression of autophagy-related genes in the liver compared to healthy cows, while cows with clinical ketosis exhibited higher levels of autophagy and slight inhibition of mitophagy.
JOURNAL OF DAIRY SCIENCE
(2021)
Review
Agriculture, Dairy & Animal Science
Stephen J. LeBlanc
Summary: This paper reviews recent data and concepts on metritis, purulent vaginal discharge, and endometritis in dairy cows and their impact on reproductive performance. It discusses the causes, diagnosis, and treatment of these diseases, as well as the potential for improved management strategies.
Article
Agriculture, Dairy & Animal Science
Paula C. C. Molinari, Brittney D. Davidson, Jimena Laporta, Geoffrey E. Dahl, I. Martin Sheldon, John J. Bromfield
Summary: Heat stress increases susceptibility to uterine diseases in dairy cows. This study shows that implementing evaporative cooling to alleviate heat stress during late pregnancy can have carry-over effects on postpartum innate immunity, potentially reducing the incidence of uterine disease.
JOURNAL OF DAIRY SCIENCE
(2023)
Article
Agriculture, Dairy & Animal Science
Geqi Yan, Hao Li, Zhengxiang Shi
Summary: The study demonstrated that thermal indices represented by the Comprehensive Climate Index (CCI) showed better correlation with heat stress indicators in dairy cows. Only through comprehensive analysis using indices like CCI and Equivalent Temperature Index, can the severity of heat stress in dairy cows be accurately assessed.
Review
Agriculture, Dairy & Animal Science
Zitai Guo, Shengtao Gao, Jialiang Ouyang, Lu Ma, Dengpan Bu
Summary: Heat stress negatively affects milk protein synthesis in dairy cows, potentially by reducing appetite and dry matter intake, leading to oxidative stress and regulating apoptosis, reducing mammary epithelial cell numbers, and influencing endocrine function. Further research is needed to fully understand the mechanisms involved.
Article
Agriculture, Dairy & Animal Science
K. Halli, I. Cohrs, K. Bruegemann, C. Koch, S. Koenig
Summary: Heat stress affects the concentrations of metabolites in dairy cows and calves, particularly in lipid metabolism.
JOURNAL OF DAIRY SCIENCE
(2023)
Article
Agriculture, Dairy & Animal Science
Jie Cai, Chao Miao, Yi Chen, Yunyi Xie, Jianxin Liu, Diming Wang
Summary: The study showed that feeding nano-sized zinc oxide (nZnO) and zinc-methionine (Zn-Met) to dairy cows did not significantly affect lactation performance, zinc concentrations in milk and plasma, blood hematological profiles, and mammary permeability.
Article
Agriculture, Dairy & Animal Science
R. Held-Montaldo, D. Cartes, P. Sepulveda-Varas
Summary: This study found that metritis in transition dairy cows may result in longer lying times. Weather variables such as precipitation and heat stress could affect lying and rumination behavior in sick cows.
JOURNAL OF DAIRY SCIENCE
(2021)
Article
Agriculture, Dairy & Animal Science
Cara Hatfield, William Tulley, Rachel Hall, Bethany Eloise Griffiths, Andreas Foskolos, Robert Frank Smith, Georgios Oikonomou
Summary: This study investigated the changes in muscle tissue reserves in high producing dairy cows before and after calving, and identified differences between farms and their association with genetic merit for milk yield. Animals that mobilised more muscle tissue had an increased time to first service.