Which of the following structures is not a part of the digestive tract of pigs? by Sunday | Jun 8 | Agricultural Science WAEC | 0 comments A. oesophagus B. proventriculus C. duodenum D. colon Correct Answer: Option B – proventriculus Users Also Read These:Which of the following is not a characteristic of pigs?JSS 2 First Term Agricultural Science Lesson Note -… The part of the digestive tract of birds which…The part of the mammalian digestive system where…Which of the following structures produces the…