{"id":{"repo_id":"tamu","oai_identifier":"oai:oaktrust.library.tamu.edu:1969.1/3946"},"canonical_url":"https://search.dev.ndltd.org/etd/tamu/oai:oaktrust.library.tamu.edu:1969.1/3946","repository":{"repo_id":"tamu","name":"Texas A&M University","base_url":"https://oaktrust.library.tamu.edu/server/oai/request"},"display":{"title":"Effect of once-daily suckling and parity on follicular dynamics in postpartum Brahman cows","abstract":"Changes in follicular dynamics were monitored in forty-four Brahman multiparous (n=30) and primiparous (n=14) cows randomly assigned to control (n=22) and once-daily suckling (n=22) treatments. Daily transrectal ultrasonography images were taken from d 21 through 88 post-calving or detection of first estrus. Suckling treatment was introduced on d 28 post-calving. Follicular waves were profiled and characterized by development and regression of a variable number of small and medium sized (2-9 mm) follicles before one of the follicles differentiated and became the dominant follicle. Primiparous cows had 34% more (P<0.04) follicular waves (4.8 + 0.6) than did the multiparous cows (3.1 + 0.4) prior to first ovulation (FO). Once-daily suckled multiparous cows had 37% fewer (P<0.03) follicular waves (2.4 + 0.5) prior to FO than controls. Interval from calving to FO was reduced (P < 0.05) by an average of 12 d by once-daily suckling in multiparous cows. Primiparous cows developed 30% more (P<0.02) dominant follicles (6.3 + 0.6) from d 21 to estrus than did the multiparous cows (4.3 + 0.4). Ovulation before d 88 occurred in 42 of 44 (95%) cows. Behavioral estrus was not detected in 40 of 42 (95%) cows at FO. The length of the subsequent estrous cycle was short (<17 days) in 39 of 42 (93%) cows. We can conclude from these data that ovarian function is resumed shortly after parturition and ovulation of a dominant follicle ends postpartum anestrous. Primiparous cows experienced more follicular waves and therefore grew more dominant follicles prior to first estrus. Once-daily suckling hastened return to estrus and reduced the number of follicular waves prior to first post-partum estrus in multiparous cows. The incidence of first ovulation being associated with behavioral estrus was low. Short cycles followed first ovulation. It appears obligatory that postpartum Brahman cows experience a silent ovulation with formation of functional luteal tissue prior to resumption of normal estrous cyclicity.","abstract_html":"Changes in follicular dynamics were monitored in forty-four Brahman multiparous (n=30) and primiparous (n=14) cows randomly assigned to control (n=22) and once-daily suckling (n=22) treatments. Daily transrectal ultrasonography images were taken from d 21 through 88 post-calving or detection of first estrus. Suckling treatment was introduced on d 28 post-calving. Follicular waves were profiled and characterized by development and regression of a variable number of small and medium sized (2-9 mm) follicles before one of the follicles differentiated and became the dominant follicle. Primiparous cows had 34% more (P&lt;0.04) follicular waves (4.8 + 0.6) than did the multiparous cows (3.1 + 0.4) prior to first ovulation (FO). Once-daily suckled multiparous cows had 37% fewer (P&lt;0.03) follicular waves (2.4 + 0.5) prior to FO than controls. Interval from calving to FO was reduced (P &lt; 0.05) by an average of 12 d by once-daily suckling in multiparous cows. Primiparous cows developed 30% more (P&lt;0.02) dominant follicles (6.3 + 0.6) from d 21 to estrus than did the multiparous cows (4.3 + 0.4). Ovulation before d 88 occurred in 42 of 44 (95%) cows. Behavioral estrus was not detected in 40 of 42 (95%) cows at FO. The length of the subsequent estrous cycle was short (&lt;17 days) in 39 of 42 (93%) cows. We can conclude from these data that ovarian function is resumed shortly after parturition and ovulation of a dominant follicle ends postpartum anestrous. Primiparous cows experienced more follicular waves and therefore grew more dominant follicles prior to first estrus. Once-daily suckling hastened return to estrus and reduced the number of follicular waves prior to first post-partum estrus in multiparous cows. The incidence of first ovulation being associated with behavioral estrus was low. Short cycles followed first ovulation. It appears obligatory that postpartum Brahman cows experience a silent ovulation with formation of functional luteal tissue prior to resumption of normal estrous cyclicity.","abstract_has_math":false,"creators":["Ramirez, Javier, III"],"institution":"Texas A&M University","degree_name":"Master of Science","degree_level":"Masters","degree_discipline":"Physiology of Reproduction","degree_department":null,"school":null,"contributors":[],"advisors":["Randel, Ron D."],"committee_chairs":[],"committee_members":["Carstens, Gordon","Forbes, David","Stanko, Randy L.","Welsh, Tom H."],"year":2006,"date_issued":"2006-08-16","date_published":"2006-08-16","updated_at":"2026-08-21T16:48:40Z","subjects":["Suckling","Parity","Follicular Dynamics"],"languages":["en_US"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1969.1/3946","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"source_record":{"url":"https://oaktrust.library.tamu.edu/server/oai/request?verb=GetRecord&metadataPrefix=dim&identifier=oai%3Aoaktrust.library.tamu.edu%3A1969.1%2F3946","prefix":"dim"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Randel, Ron D."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Carstens, Gordon","Forbes, David","Stanko, Randy L.","Welsh, Tom H."]},{"key":"dc:creator","label":"Author","values":["Ramirez, Javier, III"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2006-08-16T19:10:36Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2006-08-16T19:10:36Z"]},{"key":"dc:date.issued","label":"Date","values":["2006-08-16"]},{"key":"dc:publisher","label":"Institution","values":["Texas A&M University"]},{"key":"dc:type","label":"Dc Type","values":["Book","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physiology of Reproduction"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Texas A&M University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Suckling","Parity","Follicular Dynamics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1969.1/3946"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Changes in follicular dynamics were monitored in forty-four Brahman multiparous (n=30) and primiparous (n=14) cows randomly assigned to control (n=22) and once-daily suckling (n=22) treatments. Daily transrectal ultrasonography images were taken from d 21 through 88 post-calving or detection of first estrus. Suckling treatment was introduced on d 28 post-calving. Follicular waves were profiled and characterized by development and regression of a variable number of small and medium sized (2-9 mm) follicles before one of the follicles differentiated and became the dominant follicle. Primiparous cows had 34% more (P<0.04) follicular waves (4.8 + 0.6) than did the multiparous cows (3.1 + 0.4) prior to first ovulation (FO). Once-daily suckled multiparous cows had 37% fewer (P<0.03) follicular waves (2.4 + 0.5) prior to FO than controls. Interval from calving to FO was reduced (P < 0.05) by an average of 12 d by once-daily suckling in multiparous cows. Primiparous cows developed 30% more (P<0.02) dominant follicles (6.3 + 0.6) from d 21 to estrus than did the multiparous cows (4.3 + 0.4). Ovulation before d 88 occurred in 42 of 44 (95%) cows. Behavioral estrus was not detected in 40 of 42 (95%) cows at FO. The length of the subsequent estrous cycle was short (<17 days) in 39 of 42 (93%) cows. We can conclude from these data that ovarian function is resumed shortly after parturition and ovulation of a dominant follicle ends postpartum anestrous. Primiparous cows experienced more follicular waves and therefore grew more dominant follicles prior to first estrus. Once-daily suckling hastened return to estrus and reduced the number of follicular waves prior to first post-partum estrus in multiparous cows. The incidence of first ovulation being associated with behavioral estrus was low. Short cycles followed first ovulation. It appears obligatory that postpartum Brahman cows experience a silent ovulation with formation of functional luteal tissue prior to resumption of normal estrous cyclicity."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["electronic"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Effect of once-daily suckling and parity on follicular dynamics in postpartum Brahman cows"]}]}],"canonical_facts":{"dc:contributor.advisor":["Randel, Ron D."],"dc:contributor.committeemember":["Carstens, Gordon","Forbes, David","Stanko, Randy L.","Welsh, Tom H."],"dc:creator":["Ramirez, Javier, III"],"dc:date.accessioned":["2006-08-16T19:10:36Z"],"dc:date.available":["2006-08-16T19:10:36Z"],"dc:date.issued":["2006-08-16"],"dc:description.abstract":["Changes in follicular dynamics were monitored in forty-four Brahman multiparous (n=30) and primiparous (n=14) cows randomly assigned to control (n=22) and once-daily suckling (n=22) treatments. Daily transrectal ultrasonography images were taken from d 21 through 88 post-calving or detection of first estrus. Suckling treatment was introduced on d 28 post-calving. Follicular waves were profiled and characterized by development and regression of a variable number of small and medium sized (2-9 mm) follicles before one of the follicles differentiated and became the dominant follicle. Primiparous cows had 34% more (P<0.04) follicular waves (4.8 + 0.6) than did the multiparous cows (3.1 + 0.4) prior to first ovulation (FO). Once-daily suckled multiparous cows had 37% fewer (P<0.03) follicular waves (2.4 + 0.5) prior to FO than controls. Interval from calving to FO was reduced (P < 0.05) by an average of 12 d by once-daily suckling in multiparous cows. Primiparous cows developed 30% more (P<0.02) dominant follicles (6.3 + 0.6) from d 21 to estrus than did the multiparous cows (4.3 + 0.4). Ovulation before d 88 occurred in 42 of 44 (95%) cows. Behavioral estrus was not detected in 40 of 42 (95%) cows at FO. The length of the subsequent estrous cycle was short (<17 days) in 39 of 42 (93%) cows. We can conclude from these data that ovarian function is resumed shortly after parturition and ovulation of a dominant follicle ends postpartum anestrous. Primiparous cows experienced more follicular waves and therefore grew more dominant follicles prior to first estrus. Once-daily suckling hastened return to estrus and reduced the number of follicular waves prior to first post-partum estrus in multiparous cows. The incidence of first ovulation being associated with behavioral estrus was low. Short cycles followed first ovulation. It appears obligatory that postpartum Brahman cows experience a silent ovulation with formation of functional luteal tissue prior to resumption of normal estrous cyclicity."],"dc:format.medium":["electronic"],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["https://hdl.handle.net/1969.1/3946"],"dc:language.iso":["en_US"],"dc:publisher":["Texas A&M University"],"dc:subject":["Suckling","Parity","Follicular Dynamics"],"dc:title":["Effect of once-daily suckling and parity on follicular dynamics in postpartum Brahman cows"],"dc:type":["Book","Thesis"],"thesis:degree_discipline":["Physiology of Reproduction"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Texas A&M University"]},"updated_at":"2026-08-21T16:48:40Z"}