Temperature and retention time in condi- tioning can affect feed pro- duction, pellet quality, and con- sequently bird performance.
Conditioning and its effect on poultry feed
Temperature and retention time in conditioning can affect feed production, pellet quality, and consequently bird performance. Conditioning therefore is an important part in the pelleting process.
BY AMIR ATTAR, ALIREZA ABBASIPOUR AND SAMIRA HASSANPOUR, NEW MILLENNIUM FEED PROCESSING, IRAN
C
onditioning the feed is an important part of feed processing. When mash feed passes through the conditioner, it is exposed to high pressure steam. This steam provides the heat and moisture required
for starch gelatinisation, particles adhesion and removal of pathogens in the mash. The steam temperature and retention time in the conditioner are two important factors that can influence pellet quality, defined with the so-called pellet durability index (PDI) and the hardness level of the pellet.
Previous studies showed that the optimum temperature for producing high quality pellets is 80°C, and the minimum re- tention time in the conditioner is 30 seconds. In conditioners with a high retention time, feed undergoes a three to four minute conditioning process in order to improve the adhe- sion characteristics of the pellet. A higher retention time in the conditioner causes more moisture penetration into the feed particles, and can be obtained through reducing peddle movement for example. A study by Attar et al., (2017) demon- strated that increasing the retention time of the mash diet in the conditioner (with a constant temperature) increases the PDI and hardness. Briggs et al., (1999) found that increasing the retention time (from 5 to 15 seconds) in the conditioner and adjusting peddles’ angle increased the PDI from 42.2 to 72.2%. Steam temperature can also have a great effect on pellet quality. Abdollahi et al., (2011) reported that steam conditioning feed at 60, 75 and 90°C improved PDI by 490%, 508% and 541% and hardness by 226%, 275% and 433%, respectively compared to dry conditioning. But while increas- ing temperature in the conditioner can enhance pellet quali- ty, it can also lead to biochemical reactions which in turn can
▶ ALL ABOUT FEED | Volume 25, No. 10, 2017 17
PHOTO: TWAN KASTERMANS
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50
