Do different vaccination regimes affect the growth performance, immune status, carcase characteristics and meat quality of broilers?

Abstract

1. A vaccination regime is a schedule for the administration of vaccines which may vary according to country or even by farm. This study aimed to measure the production and health performance of broilers treated with different vaccination regimes. 2. A total of 108 Cobb 500 broiler birds were randomly divided into three treatment groups, with six replicates consisting of six birds per replicate. Each treatment group was administered with different vaccination regimes against Newcastle Disease (ND), Infectious Bronchitis (IB) and Infectious Bursal Disease (IBD). Treatment 1 (T1) broilers were vaccinated against ND+IB and IBD on days 7 and 14 of age, respectively (control); Treatment 2 (T2) broilers were vaccinated against ND+IB on days 3 and 7 of age, and IBD on day 14; and Treatment 3 (T3) broilers were vaccinated against ND+IB on days 7 and 21 and IBD on day 14. Throughout the 42-day study period, data and samples were collected to determine the growth performance, immune status, carcase characteristics and meat quality. 3. There were significant differences (P < 0.05) on growth performance (body weight, body weight gain, feed intake and cumulative feed conversion ratio), white blood cell count (heterophils percentage, lymphocytes percentage and heterophils to lymphocytes ratio), carcase characteristics (kill-out weight, de-feathered weight, dressing percentage, drumsticks and gastrointestinal tract weight) and meat quality (cooking loss and drip loss) between treatments. T1 broilers showed better growth, white blood cell count, carcase characteristics and meat quality compared to T2 and T3 broilers. 4. Based on findings from the current work, vaccination against ND+IB and IBD on days 7 and 14 proved to be the best vaccination regime for broiler production, due to the better production performance and health status of broilers.

Can Yucca schidigera Be Used to Enhance the Growth Performance, Nutrient Digestibility, Gut Histomorphology, Cecal Microflora, Carcass Characteristic, and Meat Quality of Commercial Broilers Raised under Tropical Conditions?

“…There is a strong relationship between body weight and carcass weight, as well as between carcass weight and dressing percentage [ 30 ]. Phytobiotics could be practiced to enhance the carcass traits while adding value to poultry products due to their antimicrobial and antioxidant characteristics [ 23 ].…”

“…In the current study, T6 broilers supplemented with the highest Y. schidigera demonstrated a superior meat quality during the starter and finisher phases by influencing the muscle pH, cooking loss, and drip loss of both breast and drumstick muscle. Referring to one study, prolonged time secretion of corticosterone under chronic heat stress may have detrimental effects on the breakdown of muscle due to gluconeogenesis [ 30 ]. The accelerated lactic acid production induces rapid pH decline while the body temperature is high, which results in a PSE-like conditions in meat.…”

“…Nevertheless, steroidal saponins in Y. schidigera demonstrating antioxidant activity to prevent, delay, and protect against cell deterioration could be applied against heat stress effect to maintain the pH value which was observed in T6 broilers. Thus, a higher pH of poultry meat will then lead to a decrease in cooking loss and drip loss [ 30 ]. Supplementing 100 mg/kg Y. schidigera in the current study was also found to assist in reducing the cooking loss and drip loss significantly by improving water holding capacity (WHC), and this again could be attributed to the antioxidant property of saponins [ 35 ].…”

Effect of Immune Stress on Growth Performance and Immune Functions of Livestock: Mechanisms and Prevention

“…Although the reduction of feed intake, digestion, and absorption are the most important factors in IS-induced growth suppression of livestock, the redistribution of nutrients also plays a role [ 90 ]. After the regulation of multiple hormones (growth hormone (GH), thyroid hormone, IGF-1, and GC) and cytokines, the body will redirect nutrients originally used for muscle synthesis and growth to the immune system to maintain a highly activated immune system to prevent diseases, resulting in an increase in FCR [ 90 , 91 , 92 , 93 , 94 , 95 ].…”

Colostral immunity of piglets to the Aujeszky disease virus in case of active immunization sows

“…Активувати механізм специфічного імунного захисту можливо шляхом імунізації тварин антигенами збудників інфекційних хвороб -вакцинацією (Riber et al, 2015;Langel et al, 2016). Слід зауважити, що один із найважливіших факторів у проведенні ефективної імунопрофілактики -це імунізація тварин з урахуванням рівня колостральних антитіл, специфічних до вакцинного антигену, оскільки високий рівень материнських антитіл може сприяти нейтралізації вакцинного антигену (Choe et al, 2020), що впливає на рівень імунної відповіді за введення вакцинного антигену, та, як наслідок, на захист тварин (Kielland et al, 2015;Chung et al,, 2020).…”