Animal Sciences Commons^™

Evaluating The Effects Of 6-Day And 7-Day Fixed-Time Artificial Insemination Protocols Using Sex-Sorted Semen On Pregnancy In Beef Cattle, Nicole Noel Noga

Graduate Theses and Dissertations

In this study, 527 beef heifers from three locations across two states were enrolled between November 2020 and May 2021 for experiment 1, divided into three sub-experiments: 1A (n = 85), 1B (n = 383), and 1C (n = 59). These heifers were randomly assigned to one of four treatment groups. Treatments 1 and 2 involved a 6-day CO-Synch + CIDR protocol, including administration of gonadotropin-releasing hormone (GnRH; 100 μg IM; Factrel; Zoetis Animal Health, Parssipany, NJ) and a CIDR insert (EAZI-BREED CIDR; 1.38g P4; Zoetis Animal Health) on Day 0, followed by prostaglandin F2α (PGF2α; 25 mg IM; Lutalyse …

Improvement In Simple Artificial Insemination In Sheep Using Chilled Extended Semen And Consideration Of Fertility In Ewes, Mohan Acharya

Graduate Theses and Dissertations

Three studies were conducted to improve simple artificial insemination in sheep using chilled extended semen and evaluate methods to predict fertility in ewes. The first study evaluated the effect of semen extenders and storage temperature on motility parameters of ram semen stored for up to 72 h. Single semen collected from each ram was divided into four parts and extended using four extenders: milk, TRIS, TEST, and CJ-2, diluted to 600 million sperm/ml and loaded into 0.25 ml straws for storage at 4 and 15° C. Most of the CASA motility parameters were higher after extension and storage at 4 …

Design, Acnd Construction Of A Portable Artificial Insemination Chute, Chris Herrera

BioResource and Agricultural Engineering

This senior project report discusses the design, construction, and evaluation of a portable artificial insemination chute for the use of the Cal Poly Beef Department. The design was based on the suggested modifications from operators of several other chutes currently in use.

The main areas considered for the design were; Ergonomics, cattle safety, factors effecting maximum breeding conception rates, and Portability.

The breeding chute proved superior over traditional chutes in a variety of ways. Improvement occurred in the areas of consideration as follows, user operation was simplified, animal stress was decreased, and maximum breeding efficiency was obtained.

Institution Of Presynch Protocol, Justin Breedyk

Dairy Science

The objective of this study was to compare factors of reproductive efficiency between two separate ovulation synchronization programs, with one that includes presynchronization of all fresh cows and one that does not ovsynch cows until they have been found open after initial insemination. In recent years, reproductive efficiency has declined as other areas of the dairy business have continued to excel. The investigation was performed on two dairies in Hart, Texas, White River Ranch and VB Dairy. The dairies include herds of 5,000 and 3,000 milking cows, respectively. Data was retrieved using Dairy Comp 305 and covered a two month …

Effectiveness Of A Presynchronization Program Implemented On A Modern Dairy Facility, R. (Robert) E. Thommen

Dairy Science

The objective of this study was to determine the success of a presynchronization program implemented on a modern dairy facility. The study was conducted on a 1,400 cow dairy in the central valley of California. 86 cows were involved in the study during the summer months of June through September. Cows were either assigned in the synchronization program or placed in a control group based on the last digit of their identification. At 43 DIM, presync cows were injected with their first treatment of the synchronization program. Estrous cycles of the presync group were manipulated with treatments of Prostaglandin and …

Formation Of Cull Cow Program For The Artificial Insemination Class, Brian O. Medeiros

Dairy Science

Cal Poly’s “Learn by Doing” philosophy is one of the great traits that the University holds. However it is this philosophy that is also one of the most expensive and hardest to maintain. “Production agriculture majors use more dollars per unit than any other major in the entire college,” as Dr. Golden stated during his talks about herd cut backs. Never the less the College of Agriculture prides itself on supplying knowledgeable and experienced students to the industry that supports it so much. One of the amazing classes that are offered at the university is the Dairy Science Artificial Insemination …