FARM: Reproduction: Mastitis Intro and Immunity

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Questions and Answers

Which of the following is a possible way for cows to acquire mastitis?

  • Through inhalation of airborne pathogens
  • Through ingestion of contaminated feed
  • Through transfer of viable pathogens on the teat end (correct)
  • Through contact with infected animals

Which of the following is NOT a potential consequence of mastitis infection in cows?

  • Death due to toxaemia
  • Permanent damage to the udder and reduced milk yield
  • Spread of infection within the herd
  • Enhanced immunity against future infections (correct)

Which of the following pathogens is considered an environmental pathogen that can cause mastitis in cows?

  • Strep. Agalactiae
  • Strep. dysgalactiae
  • Strep. uberis (correct)
  • Staph. aureus

Which of the following pathogens is considered a contagious pathogen that can cause mastitis in cows?

<p>Strep. Agalactiae (A)</p> Signup and view all the answers

What is the potential outcome if a cow does not clear a mastitis infection?

<p>Permanent damage to the udder and reduced milk yield (A)</p> Signup and view all the answers

What factors determine the consequences of mastitis infection in cows?

<p>The number and type of invading pathogens and the cow's immunity (A)</p> Signup and view all the answers

Which of the following is a potential consequence of mastitis infection in cows?

<p>Permanent damage to udder (D)</p> Signup and view all the answers

How do cows acquire mastitis?

<p>Through contact with contaminated teat end (B)</p> Signup and view all the answers

Which of the following pathogens is considered an environmental pathogen that can cause mastitis in cows?

<p>Streptococcus uberis (D)</p> Signup and view all the answers

Which of the following pathogens is considered a contagious pathogen that can cause mastitis in cows?

<p>Streptococcus agalactiae (D)</p> Signup and view all the answers

What is the primary mode of transfer for viable pathogens to cause mastitis in cows?

<p>Contact (B)</p> Signup and view all the answers

What determines the consequences of mastitis infection in cows?

<p>Number and type of invading pathogen (A)</p> Signup and view all the answers

Which of the following is a potential cause of high SCC milk?

<p>Outbreaks of CM or SCC (C)</p> Signup and view all the answers

What is the primary mode of transfer for viable pathogens to cause mastitis in cows?

<p>Teat lesions (A)</p> Signup and view all the answers

Which component of the mammary gland defense system is a first line of defense?

<p>Innate immune system (A)</p> Signup and view all the answers

What is the aim of preventing colonisation of teat skin with bacteria?

<p>Bacteriostatic fatty acids (A)</p> Signup and view all the answers

Which of the following can compromise the teat skin defense system?

<p>Warts (D)</p> Signup and view all the answers

What should be done to prevent post milking teat lesions?

<p>All of the above (D)</p> Signup and view all the answers

What are the components of the acquired immune system in the mammary gland defense system?

<p>Humoral memory and cellular memory (C)</p> Signup and view all the answers

Which of the following is the primary function of the teat sphincter muscle?

<p>To close the teat canal (C)</p> Signup and view all the answers

What is the purpose of the keratin plug that forms over the teat end?

<p>To seal the teat end (D)</p> Signup and view all the answers

What can cause teat canal damage in cows?

<p>Milking machines (A)</p> Signup and view all the answers

Which of the following is NOT a component of the innate immune system inside the udder?

<p>Complement (D)</p> Signup and view all the answers

What is the primary function of lactoferrin in milk?

<p>To inhibit the growth of iron-requiring bacteria (A)</p> Signup and view all the answers

Which of the following is a bacteriocidal protein found in milk?

<p>Lysozyme (C)</p> Signup and view all the answers

Which of the following is NOT a function of resident leucocytes in the udder?

<p>Triggering the acquired immune system (D)</p> Signup and view all the answers

What is the primary function of the acquired immune system in the mammary gland defense system?

<p>Activation of B &amp; T lymphocytes (A)</p> Signup and view all the answers

Which of the following is NOT an antimicrobial substance found in milk?

<p>Complement (A)</p> Signup and view all the answers

What is the primary function of lactoperoxidase in milk?

<p>To inhibit the growth of bacteria (C)</p> Signup and view all the answers

Which of the following is NOT a potential cause of teat end hyperkeratosis?

<p>Genetics (A)</p> Signup and view all the answers

What is the primary aim of using teat sealants at drying off?

<p>To prevent colonisation of teat skin with bacteria (A)</p> Signup and view all the answers

Which of the following is the correct order of events in neutrophil function?

<p>Migration, endothelium, phagocytosis, respiratory burst (A)</p> Signup and view all the answers

Which type of lymphocytes circulate through the lymphatic system and are exposed to antigens in tissue fluids?

<p>B lymphocytes (A)</p> Signup and view all the answers

Which type of antibody is produced by B lymphocytes during the initial immune response?

<p>IgM (A)</p> Signup and view all the answers

Which type of antibody is produced by B lymphocytes after repeated exposure to antigens?

<p>IgG2 (D)</p> Signup and view all the answers

Which type of lymphocytes present antigens to T lymphocytes?

<p>Dendritic cells (C)</p> Signup and view all the answers

Which type of T cells stimulate the immune response by producing cytokines following antigen recognition?

<p>T helper cells (D)</p> Signup and view all the answers

Which of the following factors is NOT known to affect mammary gland immunity?

<p>Vaccination (B)</p> Signup and view all the answers

Which breed is known to have lower somatic cell count (SCC) and clinical mastitis frequency compared to Holstein?

<p>Brown Swiss (B)</p> Signup and view all the answers

Which of the following is NOT a trait currently used for selecting genetic resistance to mastitis?

<p>Clinical mastitis incidence (D)</p> Signup and view all the answers

What is the potential consequence of having a low somatic cell count (SCC) in cows?

<p>Decreased susceptibility to mastitis (B)</p> Signup and view all the answers

What is the primary function of lactoferrin in milk?

<p>Neutralizing pathogens (A)</p> Signup and view all the answers

What can compromise the teat skin defense system in cows?

<p>Teat canal damage (B)</p> Signup and view all the answers

What is the primary function of the teat sphincter muscle in cows?

<p>Regulating milk flow (D)</p> Signup and view all the answers

Which vitamin deficiency can result in slow migration and weaker activity of leucocytes?

<p>Vitamin E (D)</p> Signup and view all the answers

What is the primary consequence of Sub-acute Rumen Acidosis (SARA) in cows?

<p>Reduced appetite (A)</p> Signup and view all the answers

Which vaccine is authorized in the U.K. for mastitis protection and reduces the incidence and severity of clinical mastitis?

<p>Startvac (C)</p> Signup and view all the answers

Which pathogen is Startvac vaccine designed to protect against?

<p>Staphylococcus aureus (A)</p> Signup and view all the answers

What is the primary aim of using teat sealants at drying off?

<p>Reduce incidence of clinical mastitis (C)</p> Signup and view all the answers

Which pathogen is included in UBAC vaccination but has little efficacy information available in the U.K.?

<p>Strep. Uberis (C)</p> Signup and view all the answers

What is a potential consequence of mastitis infection in cows?

<p>Weaken teat sphincter mechanism (C)</p> Signup and view all the answers

Which mineral deficiency can lead to hypocalcaemia in cows?

<p>Calcium (C)</p> Signup and view all the answers

Which component of the mammary gland defense system is a first line of defense against mastitis?

<p>Teat sphincter mechanism (C)</p> Signup and view all the answers

Which stage of lactation is associated with a high risk of acquiring new mastitis infections?

<p>Peri-parturient period (D)</p> Signup and view all the answers

During the dry period, why do existing bacterial infections persist despite the use of long-acting antibiotics at drying off?

<p>Bacteria are not flushed out (C)</p> Signup and view all the answers

Which immune cells have reduced phagocytic function in peri-parturient cows?

<p>Macrophages (C)</p> Signup and view all the answers

What is the primary reason for the impaired function of neutrophils in the early dry period?

<p>Presence of fat and cellular debris (B)</p> Signup and view all the answers

What is the primary reason for the reduced neutrophil recruitment and phagocytic ability in the periparturient period?

<p>High levels of cortisol, oestradiol, and progesterone (B)</p> Signup and view all the answers

What is the primary reason for the reduced phagocytic function of macrophages in peri-parturient cows?

<p>High levels of cortisol, oestradiol, and progesterone (D)</p> Signup and view all the answers

What is the primary reason for the formation of a keratin plug at the teat end during the dry period?

<p>To prevent bacterial entry into the udder (A)</p> Signup and view all the answers

What is the primary function of lactoferrin in milk?

<p>To prevent bacterial growth (B)</p> Signup and view all the answers

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