Stress is defined as an external influence on the balance (homeostasis) of a system, which has the potential to trigger a negative reaction.
Homeostasis maintains the stability of the body’s internal environment in response to changes in external conditions. On a very hot day, for example, an animal seeks to maintain stability by keeping in the shade, drinking more water and eating less. The scientific name for this is ‘thermoregulation’; if successful, the animal will suffer no stress.
Thermoregulation is easier during hot spells than cold spells, which is one reason why more stress-related diseases are encountered during the change from autumn to winter.
Recent research shows that even routine handling can cause stress in cattle.
When animals (including humans) are stressed, the steroid hormone cortisol is released. It supplies energy in the form of glucose and enables the animal to escape from the stressor. In this respect, it benefits the animal, but the release of cortisol can also have major negative consequences.
In livestock, too much cortisol due to constant stress can hamper successful reproduction and increase susceptibility to disease due to compromised immunity.
この記事は Farmer's Weekly の May 21, 2021 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、8,500 以上の雑誌や新聞にアクセスしてください。
すでに購読者です ? サインイン
この記事は Farmer's Weekly の May 21, 2021 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、8,500 以上の雑誌や新聞にアクセスしてください。
すでに購読者です? サインイン
Africa goes from net carbon sink to source
New research shows Africa's impact on greenhouse gases and the need to focus on climate-smart agriculture
Ireland potato farmers unable to complete planting
Irish potato farmers have reported a delay in harvest and said that the UK might have to prepare for shortages of the produce. The shortfall is due to extreme wet weather during their planting season.
Zero-residue fresh produce a reality
Retail giants are calling for caution when using biologicals and chemical pesticides,
Big boost for mohair producers in Eastern Cape
A collaboration between the Eastern Cape Development Corporation (ECDC) and the Mohair Empowerment Trust (MET) has resulted in a R1,4 million injection into four emerging Angora goat farming operations in the Eastern Cape.
KZN Youth Show at Roval Agricultural Exhibition
The KZN Youth Show will run from Friday, 24 May to Sunday, 26 May at the Royal Showgrounds in Pietermaritzburg.
Hemp permits and irrigation system handed over
In an effort to fast-track the entry of rural farmers into the cannabis and hemp industries, KwaZuluNatal Minister for Agriculture and Rural Development, Super Zuma, visited the Shukasibheme Project in Mbazwana, a co-operative in Mseleni, uMhlabuyalingana in the Umkhanyakude District, to hand over cannabis and hemp permits as well as a borehole and irrigation system.
Meet some of the heroes behind avitourism destinations
Exploring what the Garden Route offers birdwatchers, Brian Berkman discovers some special people who run hospitable places to meet and see a variety of species.
What the Citrus Academy offers aspiring producers
Cobus du Plessis takes a look at the Citrus Growers' Association of Southern Africa's Citrus Academy and how it is helping to develop aspiring farmers in the sector.
Natural-born killers of the insect world
The Myrmeleontidae family of lacewings from the Neuroptera order of insects consists of about 2 000 species of which 125 are found in South Africa.
Seeder kick-starts vegetation in challenging environments
Dr George Craven of Noorspoort, Steytlerville, in the south-eastern Karoo, is successfully using a home-built 'bedstead seeder' to re-establish veld plants in an arid area, writes Roelof Bezuidenhout.