It's a propaganda of one-child policy in China which aims to control population. 支部书记 is a kind of leader. 村民主任 is a kind of chief of rural person. If someone doesn't follow the policy, 支部书记 will take the primary responsibility, and 村民主任 will be the person in charge directly. The background is that in rural area most of people want to have a boy. I am not sure if the answer is correct.

计划生育工作：Family planning 支部书记是第一责任人；Branch secretary is the first person must be responsible for it; 村民主任是直接负责人。Chairman of the village is the person who take charge of it.

quite funny chinese expression

we should pay attention to birth rate.secretary and director should pay more attention on it.

HAHA！！ I think its a joke~~ The meaning of this propaganda is who is in charge of the birth conrol job. In Chinese, "in charge of" and "responsibility" are the same word :负责 The the interesting point here is people who saw this propaganda could also understand this as: 支部书记 and 村民主任 are first and direct person who responsible for the birth control respectively.